KR20050032514A - Color liquid crystal display unit - Google Patents

Abstract

Provide high color purity color liquid crystal display with NTSC ratio over 80%.

Color liquid crystal comprised by combining the optical shutter using the liquid crystal 7, the color filter 9 which has at least three color elements of red, green, and blue corresponding to the optical shutter, and the backlights 1 and 2 for transmission illumination. Display. The spectral transmittance at wavelength λ _n (wavelength every 5 nm of the visible region of 380 to 780 nm) by the green pixel of the color filter 9 is T ^G (λ _n ) and the wavelength λ _n nm from the backlight. When the relative luminous intensity normalized to the total luminous intensity of is set to I (λ _n ), they satisfy the following conditions (1) to (3).

(1) 500㎚ <The method according to any one of the wavelength of λ _n <530㎚

I (λ _n ) × T ^G (λ _n )> 0.01

(2) 610㎚ <a wavelength region of λ _n <650㎚

I (λ _n ) × T ^G (λ _n ) <0.0001

(3) 400㎚ <a wavelength region of λ _n <450㎚

I (λ _n ) × T ^G (λ _n ) <0.0001

Description

Color liquid crystal display device {COLOR LIQUID CRYSTAL DISPLAY UNIT}

Technical Field

The first invention of the present application relates to a color liquid crystal display device, in particular a combination of an optical shutter using a liquid crystal, a color filter having at least three color elements of red, green, and blue corresponding to the optical shutter, and a backlight for transmission lighting. A color liquid crystal display device comprising: a green color having high color purity by improving the light emission wavelength of a backlight and adjusting the transmittance of the color filter, in particular, the spectral transmittance of the green pixel of the color filter in response to the light emission wavelength of the backlight. By realizing a pixel, the present invention relates to a color liquid crystal display device that realizes a deep green image, thereby realizing a high color purity of 80% or more, more preferably 90% or more. The present invention also relates to a photosensitive colored resin composition suitable for forming green pixels of such a color liquid crystal display device and a color filter in which green pixels are formed using the same.

In addition, the second invention of the present application relates to a color liquid crystal display device, and in particular, an optical shutter using liquid crystal, a color filter having at least three color elements of red, green, and blue corresponding to the optical shutter, and for transmission lighting. A color liquid crystal display device comprising a backlight, which improves the light emission wavelength of the backlight and adjusts the transmittance of the color filter, in particular, the spectral transmittance of the red pixel of the color filter in response to the light emission wavelength of the backlight. By realizing a red pixel with high color purity, it is possible to realize a deep red image reproduction, thereby expanding the color reproduction range, and to achieve a color liquid crystal display device having a high color purity of 70% or more, and 80% or more, of NTSC ratio. will be.

Background

In recent years, the liquid crystal display device is expected to be used not only as a conventional personal computer monitor but also as a normal color television. The color reproduction range of the color liquid crystal display device is determined by the color of light emitted from the red, green, and blue pixels, and the chromaticity points in the CIE XYZ color system of each pixel are represented by (x _R , y _R ), (x _G , When y _G ) and (x _B , y _B ) are expressed, the area of a triangle surrounded by these three points on the xy chromaticity diagram is represented. In other words, the larger the area of the triangle, the more vivid color images can be reproduced. The area of this triangle is usually formed by three points of three primary colors, red (0.67, 0.33), green (0.21, 0.71), and blue (0.14, 0.08), as defined by the American National Television System Committee (NTSC). It is expressed as a ratio with respect to the area of this triangle (unit%, hereinafter referred to as "NTSC ratio") on the basis of. This value is about 40 to 50% for a typical notebook personal computer, 50 to 60% for a desktop personal computer monitor, and about 70% for a current liquid crystal TV.

A color liquid crystal display device using such a color liquid crystal display element is mainly composed of an optical shutter using a liquid crystal, a color filter having pixels of red, green, and blue, and a backlight for transmitting light, and radiated from red, green, and blue pixels. The color of light is determined by the emission wavelength of the backlight and the spectral curve of the color filter.

Generally as a backlight, the cold cathode tube which has light emission wavelength in the wavelength region of red, green, and blue is used as a light source, and the white surface light source was used for the light emission from this cold cathode tube by the light guide plate. Among the emitters of the cold cathode tube, Y ₂ O ₃ : Eu-based phosphors as red emitters, LaPO ₄ : Ce, Tb-based phosphors as green emitters, BaMgAl ₁₀ O ₁₇ : Eu-based phosphors, Sr ₁₀ (PO ₄ ) ₆ Cl as blue emitters ₂ : Eu-based phosphor is generally used. Fluorescent lamps in which an electrode is mounted in a sealed body in which a phosphor film is formed by mixing these phosphors in consideration of a white balance in a suitable compounding ratio are used as a light source for a backlight.

The backlight may also be used as a white surface light source by exciting the phosphor by the light from these, using a substrate on which the phosphor layer is formed, and a cathode tube or LED emitting light of ultraviolet, blue, or deep blue.

In the color liquid crystal display device, only the wavelength of the portion necessary for the color filter is extracted for the light emission distribution from such a backlight, thereby forming red, green, and blue pixels.

As a manufacturing method of this color filter, methods, such as a dyeing method, a pigment dispersion method, an electrodeposition method, and a printing method, are proposed. Although dyes were initially used as colorants for colorization, pigments are now used in terms of reliability and durability as liquid crystal display devices. Therefore, the pigment dispersion method is the most widely used method of manufacturing a color filter in terms of productivity and performance. In general, when the same color material is used, the NTSC ratio and the brightness are used in trade-offs depending on the use.

In recent years, however, there has been a growing demand for color liquid crystal display devices that can further widen the color reproducibility of the liquid crystal display devices and can express more vivid color images. Specifically, high color purity displays with an NTSC ratio of 80% or higher are desired.

However, in the backlight using the above-mentioned phosphor, as shown in Fig. 2, light emission occurs in a wavelength range other than red, green, and blue as sub-emission, which causes color purity to deteriorate. That is, in order to expand the color reproduction range of the liquid crystal display device, these sub-emissions are hindered.

In order to improve the color purity, when trying to adjust from the color filter side in order to sufficiently eliminate this sub-luminescence, a large amount of pigment is required, and due to the characteristic of the pigment that the spectral curve is not steep, the absorption of the main light-emitting portion is also large, and overall There was a problem that the image became dark. Moreover, the pigment concentration in each pixel of a color filter becomes high, and the performance as a photolithography material is reduced. For example, developing time is increased; Control of the pattern shape becomes difficult; Yield falls; In addition, the film thickness of the color filter becomes thicker, and the problem in the manufacturing process of the liquid crystal panel is less likely to occur, leading to an increase in the manufacturing cost of the liquid crystal display device.

In order to improve such a point, the coloring layer itself does not provide resist performance, but the method of manufacturing a color filter of thin pigment and high pigment density | concentration by etching using the positive or negative resist formed on the colored layer. Is proposed. However, in this method, the process is complicated and leads to an increase in manufacturing cost, which is not preferable.

In addition, reproduction of ultra-high color purity of NTSC ratio of 95% or more is virtually impossible with the conventional backlight using the cold cathode tube described above. This is mainly due to the green light emission wavelength of the conventional backlight having a main emission peak at 540 to 550 nm as shown in FIG. That is, although the chromaticity coordinates of green of NTSC three primary colors are (0.21, 0.71), in order to achieve this chromaticity coordinate, the main emission peak of 540-550 nm is too strong yellow.

In order to achieve an NTSC ratio of 80% or more, improvement of the backlight is essential. However, this alone is not sufficient. It is also necessary to improve the color filter for spectroscopic light from the backlight in accordance with the improvement of the backlight. . For example, since the green phosphor has a main emission peak in the range of 540 to 550 nm, the transmittance is as high as possible in this wavelength region in the green pixel of the color filter in consideration of the utilization efficiency of light, and the blue phosphor, Although the color material is adjusted to efficiently absorb the luminous material from the red phosphor, for example, when the green light emission wavelength of the backlight is changed, their balance is broken in the green pixels of the same color filter. On the other hand, in the red pixel and the blue pixel, since the light emission is weak so far that light emission from the backlight does not have to be strongly absorbed from the backlight by the color filter, the light emission can be in a state where the color material is adjusted accordingly.

In this regard, for example, Japanese Patent Application Laid-Open No. 9-97017 uses a phosphor having no emission peak at 470 to 510 nm as a light source for a backlight, and the emission spectrum of the phosphor is the same as in the present invention. Although it has a light emission spectrum different from a normal green fluorescent substance, since the combination of the appropriate color filter suitable for this light source is not considered, the ultra high color purity of NTSC ratio 80% or more was not achieved.

In this regard, even if the light emission wavelength of the backlight is improved, if the conventional color filter is used as it is, the ultra high color purity of the NTSC ratio of 80% or more, more than 90%, cannot be achieved.

On the other hand, the problem of sub-emission is also remarkable even in the red pixel. That is, since the red light emission peak is in the vicinity of the wavelength of 610 nm in the conventional phosphor, and the sub-emission by the green phosphor is in the vicinity of the wavelength of 585 to 590 nm, the contrast of the transmittance is reduced between only 20 nm of the wavelength of 590 to 610 nm. It is necessary to clarify, but color contrast materials such as pigments and dyes, which are currently commercially available, cannot achieve sufficient contrast in this wavelength range, and consequently, for high-purity red pixels, the brightness is sacrificed due to the large amount of pigment used. I was forced to.

In addition, the chromaticity of the red pixel currently used as the standard is the strongest red color (weak yellow color), and is near the chromaticity (0.65, 0.33) in the CIE XYZ colorimetric system. Strong red pixels are valid. However, bringing red pixels closer to red results in darker images. In other words, the present invention is inevitably compromised in that the red pixel can balance the brightness and the color reproduction range.

In addition, in a backlight having a red phosphor having an emission peak near 610 nm, which is conventionally used, red purity is not sufficient and reproduction of a sufficient depth of red image is difficult.

The first invention of the present application has been made in view of such circumstances, and realizes the reproduction of a deep green image by high-purity green pixels without impairing the brightness of the image, thereby achieving an NTSC ratio of 80% or more, An object of the present invention is to provide a color liquid crystal display device which exhibits high color purity of 90% or more and can realize a clear color image.

In addition, the second invention of the present application realizes the reproduction of an in-depth red image by a high color purity red pixel without impairing the brightness of the image, whereby a high color purity of 70% or more, even 80% or more, of NTSC ratio It is another object of the present invention to provide a liquid crystal display device capable of realizing a clear color image.

Disclosure of the Invention

In this application, the color liquid crystal display device which can reproduce a deep green image is made into 1st invention, and the color liquid crystal display device which can reproduce a deep red image is made into 2nd invention.

The color liquid crystal display device of the first invention is a color liquid crystal comprising a light shutter using a liquid crystal, a color filter having at least three color elements of red, green, and blue corresponding to the light shutter, and a backlight for transmission illumination. In the display device, the wavelength of every 5 nm of the visible region of 380 to 780 nm is λ _n nm, and the spectral transmittance at wavelength λ _n nm by the green pixel of this color filter is determined from T ^G (λ _n ) and the backlight. When the relative luminescence intensity normalized to the total luminescence intensity at the wavelength λ _n nm of is set to I (λ _n ), they satisfy the following conditions (1) to (3).

(1) at a wavelength of any one of 500 nm <

I (λ _n ) × T ^G (λ _n )> 0.01

(2) 610㎚ <a wavelength region of λ _n <650㎚

I (λ _n ) × T ^G (λ _n ) <0.0001

(3) 400㎚ <a wavelength region of λ _n <450㎚

I (λ _n ) × T ^G (λ _n ) <0.0001

However, I (λ _n ) is defined as follows.

Here, S (λ) is a measured value of the light emission intensity at the wavelength λ from the backlight and is usually measured at a pitch of 0.5 nm or 1.0 nm. Moreover, Δλ = 5 nm.

That is, the present inventors have diligently studied, and thus, the spectral curve of the color filter, in particular, the spectral transmittance of the green pixel and the emission spectrum of the backlight are optimized to meet the conditions of (1) to (3) above, thereby reproducing deep green color. The present invention has been found to enable a color liquid crystal display device having an NTSC ratio of 80% or more and more than 90% by this.

The condition (1) indicates that in the green wavelength region (500 to 530 nm), the light emission intensity from the green pixel is high and the chromaticity coordinates (0.21 and 0.71) of the NTSC three primary colors can be achieved.

In the conditions (2) and (3), in the red region (610 to 650 nm) and the blue region (400 to 450 nm), there is almost no unnecessary light from the backlight, and the color of the green pixel becomes cloudy. It is difficult to show.

In the present invention, in the definition of I (λ _n ), the reason for setting Δλ = 5 nm is as follows.

In other words, the measurement of the emission spectrum from the backlight is because the peak of emission from the phosphor is steep (full width at half maximum (FWHM) is small), so that the resolution of the measurement is usually set to Δλ = 0.5 nm to 1 nm. On the other hand, in the calculation of color reproducibility, such as a liquid crystal display device, if there is a resolution of about (DELTA) (lambda) = 5 nm-10 nm, it is enough practically. In the case of not FWHM >> Δλ, the apparent luminous intensity I (λ) depends on Δλ, and I (λ) is not uniquely determined unless Δλ is determined. Therefore, in the present invention, Δλ = 5 nm.

The conditions of (1) to (3) are easily achieved by containing the phosphor layer contained in the backlight or the compound represented by the following general formula (4).

M ^II _1-x Eu _x O.a (Mg _1-y Mn _y ) O.bAl ₂ O ₃ (4)

M ^II represents at least one atom selected from the group consisting of Ba, Sr and Ca, and a, b, x and y are real numbers that satisfy the following inequality.

0.8 ≤ a ≤ 1.2

4.5 ≤ b ≤ 5.5

0.05 ≤ x ≤ 0.3

0.02 ≤y ≤0.5

Such a color liquid crystal display device of the present invention can be applied to a display in any color reproduction range, but is particularly suited to a so-called ultra high-purity display having an NTSC ratio of 80% or more, even 90% or more, particularly 95% or more. It is possible to easily realize the color reproduction range which was virtually impossible with the combination of the color filter and the backlight.

In the present invention, the NTSC ratio of the color liquid crystal display device is measured by using a light luminance measuring device for each of the chromaticities of red, green, and blue as shown in Examples described later, and the color reproduction range is determined by the following equation. It can calculate by making it.

The green pixel of the color filter constituting the liquid crystal display device of the first invention is a photosensitive colored resin composition containing (a) a binder resin and / or (b) a monomer, (c) a photopolymerization clock, and (d) a colorant, (d) An isoindolinone-based pigment is contained as the colorant, and the average transmittance at 500 to 530 nm when applied at a film thickness of 2.5 μm is 20% or more and 80% or less, and more preferably 30% or more and 70% or less. It is preferable to be formed of the photosensitive colored resin composition.

The color liquid crystal display device of the second invention is a color liquid crystal comprising a light shutter using a liquid crystal, a color filter having at least three color elements of red, green, and blue corresponding to the light shutter, and a backlight for transmission illumination. In the display device,

The spectral transmittance at wavelength λ _n nm by the red pixel of this color filter is T ^R (λ _n ), and the relative luminescence intensity normalized to the total emission intensity at wavelength λ _n nm from the backlight is I (λ _n ). When it is, they are characterized by satisfy | filling the conditions of following (5) and (6).

(5) at a wavelength of any one of 615 nm ≤ λ _n ≤ 700 nm

I (λ _n ) × T ^R (λ _n ) ≥0.01

(6) at λ _n = 585 nm

I (λ _n ) × T ^r (λ _n ) <0.007

However, I (λ _n ) is the same as the first invention described above.

In the second aspect of the present invention, by satisfying the above condition (5), it is possible to efficiently transmit light emitted from the red phosphor having high color purity, and provide a brighter, higher purity red pixel. In addition, by satisfying the above condition (6), the sub-luminescence at a wavelength of 585 nm from the Tb-based phosphor generally used as the green phosphor can be efficiently cut, and the color purity of the red pixel can be further increased.

According to the second invention, the red pixel spectral curve of the color filter and the emission spectrum of the backlight are optimized on the basis of a predetermined law, thereby providing a red pixel of high color purity without compromising the brightness of the image, and furthermore, a color liquid crystal display. The enlargement of the color reproduction range of the device can be easily achieved.

In the second invention, also, 615㎚ ≤λ _n is preferable to satisfy T ^R (λ _n), the following formula (7) according to one or more of the wavelength of the ≤700㎚.

(7) T ^R (λ _n ) / T ^R (585)> 8

By satisfying the conditions of (7), the red light obtained by the above (5) and (6) is more efficiently transmitted, and the light emitted from the red phosphor is more efficiently transmitted. Pixels can be provided.

The condition of (5) is that the backlight contains a phosphor layer or a film containing a phosphor in the structure, and the phosphor layer or the phosphor film is YVO ₄ : Eu ³⁺ -based phosphor, Y (P, V) O _4. : may readily be accomplished by including one or two or more selected from the group consisting of Mn ⁴⁺ based phosphor: Eu ³⁺ based fluorescent material, and 3.5MgO 0.5MgF and ₂ and GeO _2.

Alternatively, instead of using a cold cathode tube or / and a hot cathode tube containing the phosphor as its component, as another method, it is also easily achieved by containing at least GaAsP-based LED as its component in the backlight.

Although the said 1st invention and the 2nd invention can respectively be used independently, in order to improve the color purity of both green and red, it is usually preferable to use combining 1st invention and 2nd invention.

Brief description of the drawings

1 is a diagram showing the configuration of a TFT type color liquid crystal display device.

2 is a graph showing an emission spectrum of a backlight used in a conventional color liquid crystal display device.

3 is a cross-sectional view showing an example of a backlight device suitable for the present invention.

4 is a cross-sectional view showing another example of a backlight device suitable for the present invention.

5 is a relative emission spectrum of the backlight obtained in Production Example 1. FIG.

6 is a relative emission spectrum of the backlight obtained in Production Example 2. FIG.

7 is a relative emission spectrum of the backlight obtained in Production Example 3. FIG.

Explanation of the sign

1: cold cathode tube

2: light guide plate

3: light diffusion sheet

4, 10: polarizer

5, 8: glass substrate

7: liquid crystal

9: color filter

11: light guide

12: linear light source

13: reflector

14: array

15: dimming sheet

16, 16 ': light extraction mechanism

17: reflective sheet

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Below, embodiment of the color liquid crystal display device of this invention is described in detail with reference to drawings.

[Color LCD]

The color liquid crystal display device of the present invention is configured by combining an optical shutter using liquid crystal, a color filter having at least three color elements of red, green, and blue corresponding to the optical shutter, and a backlight for transmitting illumination. Although there is no restriction | limiting in particular in a specific structure, For example, the TFT type color liquid crystal display device shown in FIG. 1 is mentioned.

Fig. 1 is an example of a TFT (thin film transistor) type color liquid crystal display device using a side light type backlight device and a color filter. In this liquid crystal display device, the light emitted from the cold cathode tube 1 is surface light source by the light guide plate 2, the light diffusion sheet 3 increases the uniformity, and then passes through the prism sheet and then the polarizing plate 4 ) Is incident. This incident light is incident on the color filter 9 by controlling the polarization direction for each pixel by the TFT 6. Finally, the polarizer 4 reaches the viewer through the polarizer 10 provided so that the polarization direction is perpendicular to the polarizer 4. Here, the degree of change in the polarization direction of the incident light is changed by the applied voltage of the TFT 6, so that the light amount of the light passing through the polarizing plate 6 is changed, so that a color image can be displayed. 5 and 8 are transparent substrates (glass substrate), and 7 is liquid crystal.

[Backlight device]

First, the configuration of a backlight device used for such a color liquid crystal display device will be described.

The backlight device used in the present invention refers to a planar light source device disposed on the rear surface of a liquid crystal panel and used as a back light source means of a transmissive or transflective color liquid crystal display device.

As a structure of a backlight apparatus, it is provided with the light source which consists of a cold cathode tube, a hot cathode tube, or a combination of both, and the light homogenizing means which converts this light source light into a substantially uniform surface light source; By installing on the substrate surface a light source formed by combining one or two or more of an LED, a cold cathode tube, a hot cathode tube, a planar light emitting element that emits ultraviolet rays or blue or deep blue, and a phosphor which emits visible light by the light source light. Providing a substrate having a function of converting it into visible light; A method of combining three color LEDs emitting light in the red, green, and blue wavelength ranges; Etc. can be mentioned.

As a method of installing a light source such as a cold cathode tube, a hot cathode tube, and an LED, a method of installing a light source directly below the rear surface of the liquid crystal element (direct method), or using a light-transmitting light guide such as an acrylic plate by installing a light source on the side surface The method of converting light into a surface shape to obtain a surface light source (side light method) is typical. Among these, as the surface light source that is thin and has excellent uniformity in luminance distribution, the side light system as shown in Figs. 3 and 4 is preferable, and is currently most widely used.

In the backlight device of FIG. 3, a linear light source 12 is provided on a substrate made of a light-transmissive flat plate, that is, on one side end face 11a of the light guide 11 along the side end face 11a. ), The reflector 13 is mounted, and the direct light by the linear light source 12 and the reflected light reflected by the reflector 13 are incident on the inside of the light guide 11 from one side end face 11a which is a light incidence end face. It is configured to let. One plate surface 11b of the light guide 11 becomes a light output surface, and on this light output surface 11b, the dimming sheet 15 which formed the substantially triangular prism array 14 is the array 14 The right angle of is installed toward the observer side. On the plate surface 11c on the side opposite to the light exit surface 11b in the light guide 11, a light extraction mechanism 16 formed by printing a plurality of dots 16a in a predetermined pattern by light scattering ink is provided. It is. On the plate surface 11c side, the reflection sheet 17 is provided in proximity to the plate surface 11c.

In the backlight device of FIG. 4, the dimming sheet 15 on which the prism array 14 having a substantially triangular prism shape is formed is provided with the right angle of the array 14 toward the light exit surface 11b side of the light guide 11. And the light extraction mechanism 16 'provided on the plate surface 11c corresponding to the light exit surface 11b of the light guide 11 is a rough surface pattern 16b in which each surface is formed on the rough surface. Unlike the backlight device shown in FIG. 3, the point is configured in the same manner except for the above.

Such a side light type backlight device can more effectively derive the characteristics of the liquid crystal display device, which is light and thin.

As a light source of such a backlight device, generally any type can be used as long as it is a type which has light emission in the wavelength range of red, green, and blue, ie, the range of 580-700 nm, 500-550 nm, 400-480 nm.

In the first invention of the present application, in order to increase the color purity of the green pixel and reproduce the deep green image, it is necessary that the relative light emission intensity I (λ _n ) of 500 to 530 nm is high as the green light emitting region.

As a method for ensuring that the backlight satisfies such conditions, three kinds of main emission wavelength peaks in the range of the red region (610 to 700 nm), the green region (500 to 530 nm), and the blue region (400 to 480 nm) or the like In the method of mixing and using the above-mentioned fluorescent substance or LED, the method of combining yellow-emitting fluorescent substance and blue-emitting LED, etc., there exists a method of adjusting a compounding ratio so that said relative light emission intensity I ((lambda) _n ) is obtained.

The former method will be described as an example. In the first invention, as the phosphor having the main emission wavelength in the red region, Y ₂ O ₃ : Eu-based phosphor, Y (P, V) O ₄ : Eu ³⁺ -based phosphor, 3.5MgO. 0.5MgF ₂ and GeO _2: Mn ⁴⁺ based fluorescent material can be given. Here, in the Y (P, V) O ₄ : Eu ^{3+ type} phosphor, either one of P or V, or both thereof can be used, and the main emission wavelength can be finely adjusted by the ratio of P and V. .

In the first invention, phosphors having a main emission wavelength in the green region include LaPO ₄ : Ce, Tb phosphors, Zn ₂ SiO ₄ : Mn phosphors, M ^II _1-x Eu _x O · a (Mg _1-y Mn _y ) O BAl ₂ O ₃ phosphor (M ^II represents at least one atom selected from the group consisting of Ba, Sr and Ca, and a, b, x, y represent 0.8 ≦ a ≦ 1.2, 4.5 ≦ b ≦ 5.5, 0.05 Real numbers satisfying ≤ x ≤ 0.3 and 0.02 ≤ y ≤ 0.5). M ^II _1-x Eu _x O.a (Mg _1-y Mn _y ) O.bAl ₂ O ₃ phosphors having a main emission wavelength in the vicinity of 515 nm in particular in terms of the emission wavelength (M ^II consists of Ba, Sr and Ca At least one atom selected from the group, in particular Ba, is preferably used, and a, b, x, y are 0.8 ≦ a ≦ 1.2, 4.5 ≦ b ≦ 5.5, 0.05 ≦ x ≦ 0.3, 0.02 ≦ real number satisfies y ≤ 0.5). As the LED, a GaP-based LED can be particularly preferably used.

In the first invention, phosphors having a main emission wavelength in the blue region include BaMgAl ₁₀ O ₁₇ : Eu phosphors, (Sr, Ca, Ba) ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu phosphors, or (Sr, Ca, Ba, Mg) ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu phosphors. Examples of LEDs having a main emission wavelength in the blue region include InGaN-based LEDs and GaN-based LEDs.

These phosphors and / or LEDs are mixed in an appropriate blending ratio so as to take into account the white balance for determining the color tone of the image, and to obtain a relative luminous intensity I (λn) such that the above formulas (1) to (3) are obtained. use. In addition, the white balance is usually expressed by the light emission chromaticity and color temperature of the liquid crystal display element when all the red, blue, and green pixels are lit, and the chromaticity is preferably in the vicinity of the main light locus, and the color temperature is preferably 5000K to 15000K.

Such a condition is obtained in the case of a cold cathode tube in a Y ₂ O ₃ : Eu-based phosphor, a Y (P, V) O ₄ : Eu ³⁺ -based phosphor, and a 3.5 MgO.0.5MgF ₂ .GeO ₂ : Mn ⁴⁺ -based phosphor. 20 to 60 parts by weight of a total of one or two or more selected red phosphors, Zn ₂ SiO ₄ : Mn phosphor, M ^II _1-x Eu _x O · a (Mg _1-y Mn _y ) O · bAl ₂ O ₃ Phosphor (M ^II represents at least one atom selected from the group consisting of Ba, Sr and Ca, and a, b, x, y represent 0.8 ≦ a ≦ 1.2, 4.5 ≦ b ≦ 5.5, 0.05 ≦ x ≦ 0.3, 10 to 50 parts by weight of a total of one or two or more green phosphors selected from 0.02 ≦ y ≦ 0.5), BaMgAl ₁₀ O ₁₇ : Eu phosphor, (Sr, Ca, Ba) ₁₀ (PO ₄ ) ₆ A total of 20 to 55 parts by weight of one or two or more kinds of blue phosphors selected from Cl ₂ : Eu phosphors or (Sr, Ca, Ba, Mg) ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu phosphors can be realized. On the other hand, in the case of LED, by combining each number of LED chips of GaAsP-based LEDs emitting red, GaP-based LEDs emitting green, GaN-based LEDs emitting blue, the number of each is, for example, 1: 2: 1 It is feasible.

In the second invention, in order to satisfy the condition of (5) above, it is important that the main light emission wavelength is in the range of 615 to 700 nm, more preferably in the range of 615 to 660 nm with respect to the red light source.

Examples of the method in which the backlight satisfies such conditions include YVO ₄ : Eu ³⁺ -based phosphors, Y (P, V) O ₄ : Eu ³⁺ -based phosphors, and 3.5MgO.0.5MgF ₂ .GeO ₂ : Mn ⁴⁺ -based phosphors. The method of using the 1 type (s) or 2 or more types chosen from the group which consists of these, or GaAsP type | system | group LED is mentioned. In addition, in the Y (P, V) O ₄ : Eu ^{3+ type} phosphor, any one or both of P or V can be used, and the main emission wavelength can be finely adjusted by the ratio of P and V. In the invention, it is applicable in any case.

On the other hand, there is no restriction | limiting in particular about the green and blue light source, As long as the main light emission wavelength is green, as long as it is the range of the wavelength region 500-550 nm, and blue, it can use either. For example, in the case of a green light source, Zn ₂ SiO ₄ : Mn phosphor, M ^II _1-x Eu _x O.a (Mg _1-y Mn _y ) O.bAl ₂ O ₃ phosphor (M ^II is Ba, Sr and Represents at least one atom selected from the group consisting of Ca, and a, b, x, and y represent 0.8 ≦ a ≦ 1.2, 4.5 ≦ b ≦ 5.5, 0.05 ≦ x ≦ 0.3, and 0.02 ≦ y ≦ 0.5 ), GaP-based LED, blue light source, BaMgAl ₁₀ O ₁₇ : Eu phosphor, (Sr, Ca, Ba) ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu phosphor or (Sr, Ca, Ba, Mg) ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu phosphor, InGaN-based LED, and the like.

In particular, in the case of manufacturing an ultra high-purity color liquid crystal display device having an NTSC ratio of 90% or more, the main emission wavelength is in the range of 500 to 530 nm and the blue light source is 400 to 530 nm so as to satisfy the condition of the above (1) of the first invention. It is preferred to be in the 450 nm range.

As the backlight, in the same manner as in the first invention, the three or more kinds of phosphors or LEDs as described above, or both of the phosphors and the LEDs in consideration of the white balance and at the same time satisfying the above expressions (5) and (6) It uses suitably combining so that intensity | strength I ((lambda) n) may be obtained. In addition, the white balance is usually expressed by the light emission chromaticity and color temperature of the liquid crystal display device when all the red, green, and blue pixels are turned on, and it is preferable that the chromaticity is near the main light trace and the color temperature is 5000K to 15000K.

Such conditions are one or two or more reds selected from Y (P, V) O ₄ : Eu ³⁺ based phosphors, 3.5MgO.0.5MgF ₂ ㆍ GeO ₂ : Mn ⁴⁺ based phosphors in the case of cold cathode tubes. 20 to 60 parts by weight of the phosphor in total, LaPO ₄ : Ce, Tb phosphor, Zn ₂ SiO ₄ : Mn phosphor, M ^II _1-x Eu _x O · a (Mg _1-y Mn _y ) O · bAl ₂ O ₃ phosphor (M ^II represents at least one atom selected from the group consisting of Ba, Sr and Ca, and a, b, x, y represent 0.8 ≦ a ≦ 1.2, 4.5 ≦ b ≦ 5.5, 0.05 ≦ x ≦ 0.3, 0.02 10-50 parts by weight of a total of one or two or more green phosphors selected from ≤ y ≤ 0.5), BaMgAl ₁₀ O ₁₇ : Eu phosphor, (Sr, Ca, Ba) ₁₀ (PO ₄ ) ₆ Cl _2: Eu phosphor, or (Sr, Ca, Ba, Mg ) 10 (PO 4) 6 Cl 2: can be achieved by blending 20-55 parts by weight total of one or two or more kinds of a blue phosphor selected from Eu phosphor. On the other hand, in the case of LED, by combining each number of LED chips of GaAsP-based LEDs emitting red, GaP-based LEDs emitting green, GaN-based LEDs emitting blue, the number of each is, for example, 1: 2: 1 It is feasible.

[Color filter]

Next, the color filter will be described.

The color filter is formed by forming fine pixels such as red, green, and blue on a transparent substrate such as glass by dyeing, printing, electrodeposition, pigment dispersion, or the like. In most cases, a light shielding pattern called a black matrix is formed between the pixels to block leakage of light from these pixels and to obtain a higher quality image.

The color filter by a dyeing method is manufactured by forming an image with the photosensitive resin which mixed the dichromate as gelatin, polyvinyl alcohol, etc. as a photosensitive agent, and is manufactured by dyeing. The color filter by the printing method is manufactured by transferring thermosetting or photocuring ink to a transparent substrate such as glass by a method such as screen printing or flexographic printing. In the electrodeposition method, a color filter is formed by electrophoresis by immersing a transparent substrate such as glass in which an electrode is formed in a bath containing pigment or dye. A composition obtained by dispersing or dissolving a color material such as a pigment in a photosensitive resin in a color filter by a pigment dispersion method is applied onto a transparent substrate such as glass to form a coating film, which is then subjected to exposure by radiation irradiation through a photomask. The unexposed part is removed by developing to form a pattern. In addition to these methods, a method of forming a pixel image by applying a polyimide-based resin composition in which a color material is dispersed or dissolved, and forming a pixel image by an etching method, and attaching and peeling a film coated with a resin composition comprising a color material to a transparent substrate for image exposure and development To form a pixel image, a method of forming a pixel image by an injection printer, or the like.

In the production of color filters for liquid crystal display devices in recent years, the pigment dispersion method has become a mainstream in terms of high productivity and excellent micromachinability, but the color filter of the present invention can be applied to any of the above manufacturing methods. .

As a method of forming a black matrix, a method of forming a chromium and / or chromium oxide (single layer or lamination) film on the entire surface on a transparent substrate such as glass by sputtering or the like and removing only a portion of the color pixels by etching, or a light shielding component. The photosensitive composition which disperse | distributed or melt | dissolved was apply | coated on transparent board | substrates, such as glass, and a coating film is formed, this is exposed by irradiation with a radiation through a photomask, and an unexposed part is removed by image development process, and a pattern is formed. Method and the like.

[Composition for Color Filter]

Next, the pigment dispersion method which is the mainstream in recent years is demonstrated about the raw material for manufacturing a color filter.

In the pigment dispersion method, the composition (henceforth "the composition for color filters") which disperse | distributed color materials, such as a pigment, to the photosensitive resin is used as mentioned above. This color filter composition generally dissolves or disperses (a) binder resin and / or (b) monomer, (c) photopolymerization clock, (d) colorant, and (e) other components as a photosensitive component, It is the photosensitive colored resin composition for color filters which consists of.

Each component is demonstrated in detail below. In addition, below, "(meth) acryl", "(meth) acrylate", "(meth) acrylo" are respectively "acryl or methacryl" "acrylate or methacrylate" "acrylo or methacryl" Indicates.

(a) binder resin

In the case of using the binder resin alone, a suitable one is appropriately selected in consideration of the desired image forming property and performance, the manufacturing method to be employed, and the like. When using binder resin together with the monomer mentioned later, binder resin is added for the modification of the composition for color filters, and the improvement of the physical property after photocuring. In this case, therefore, the binder resin is appropriately selected in accordance with the purpose of improvement of compatibility, film formability, developability, adhesiveness, and the like.

As binder resin normally used, For example, (meth) acrylic acid, (meth) acrylic acid ester, (meth) acrylamide, maleic acid, (meth) acrylonitrile, styrene, vinyl acetate, vinylidene chloride, maleimide, etc. Single or copolymer, polyethylene oxide, polyvinylpyrrolidone, polyamide, polyurethane, polyester, polyether, polyethylene terephthalate, acetyl cellulose, novolac resin, resol resin, polyvinylphenol or polyvinyl butyral Can be mentioned.

Preferred among these binder resins are those containing a carboxyl group or a phenolic hydroxyl group in the side chain or the main chain. When resin which has these functional groups is used, image development in alkaline solution becomes possible. Among them, preferred is high alkali developability. Resins having a carboxyl group, such as acrylic acid (co) polymers, styrene / maleic anhydride resins, and acid anhydride modified resins of novolac epoxyacrylates.

Especially preferable are (co) polymers (these are called "acrylic resins") containing (meth) acrylic acid or the (meth) acrylic acid ester which has a carboxyl group. That is, since this acrylic resin is excellent in developability and transparency, and can obtain various copolymers by selecting various monomers, it is preferable at the point which is easy to control a performance and a manufacturing method.

As acrylic resin, it is (meth) acrylic acid and / or succinic acid (2- (meth) acryloyloxyethyl) ester, adipic acid (2-acryloyloxyethyl) ester, phthalic acid (2- (meth), for example. Acryloyloxyethyl) ester, hexahydrophthalic acid (2- (meth) acryloyloxyethyl) ester, maleic acid (2- (meth) acryloyloxyethyl) ester, succinic acid (2- (meth) acrylo Yloxypropyl) ester, adipic acid (2- (meth) acryloyloxypropyl) ester, hexahydrophthalic acid (2- (meth) acryloyloxypropyl) ester, phthalic acid (2- (meth) acryloyl Oxypropyl) ester, maleic acid (2- (meth) acryloyloxypropyl) ester, succinic acid (2- (meth) acryloyloxypropyl) ester, adipic acid (2-meth) acryloyloxybutyl) Ester, hexahydrophthalic acid (2- (meth) acryloyloxybutyl) ester, phthalic acid (2- (meth) acrylyloxybutyl) ester Acids (anhydrides) such as (anhydride) succinic acid, (anhydride) phthalic acid and (maleic anhydride) to hydroxyalkyl (meth) acrylates such as le, maleic acid (2- (meth) acryloyloxybutyl) ester Styrene-based monomers, such as styrene, (alpha) -methylstyrene, and vinyltoluene, are made into the essential component which added this compound as an essential component; Unsaturated group-containing carboxylic acids such as cinnamic acid, maleic acid, fumaric acid, maleic anhydride and itaconic acid; Methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, allyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, hydroxyethyl (meth Esters of (meth) acrylic acid, such as) acrylate, hydroxypropyl (meth) acrylate, benzyl (meth) acrylate, hydroxyphenyl (meth) acrylate, and methoxyphenyl (meth) acrylate; Compound which added lactones, such as (epsilon) -caprolactone, (beta)-propiolactone, (gamma)-butyrolactone, (delta) -valerolactone, to (meth) acrylic acid; Acrylonitrile; (Meth) acrylamide, N-methylol acrylamide, N, N-dimethyl acrylamide, N-methacryloyl morpholine, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylamino Acrylamides such as ethyl acrylamide; The resin obtained by copolymerizing various monomers, such as vinyl acetate, a vinyl basamate, a vinyl propionate, a vinyl cinnamate, and a vinyl pivalate, is mentioned.

Moreover, styrene, (alpha) -methylstyrene, benzyl (meth) acrylate, hydroxyphenyl (meth) acrylate, methoxyphenyl (meth) acrylate, and hydroxyphenyl (meth) acryl for the purpose of raising the strength of a coating film 10 to 98 mol%, preferably 20 to 80 mol%, more preferably 30 to 70 mol% of a monomer having a phenyl group such as amide or hydroxyphenyl (meth) acrylsulfoamide, (meth) acrylic acid, or Succinic acid (2- (meth) acryloyloxyethyl) ester, adipic acid (2-acryloyloxyethyl) ester, phthalic acid (2- (meth) acryloyloxyethyl) ester, hexahydrophthalic acid (2- 2 to 90 at least one monomer selected from the group consisting of (meth) acrylic acid esters having a carboxyl group such as (meth) acryloyloxyethyl) ester and maleic acid (2- (meth) acryloyloxyethyl) ester Mol%, preferably 20 to 80 mol%, more preferably 30 to 70 mol% Acrylic resins copolymerized in proportions are also preferably used.

Moreover, it is preferable that these resin has ethylenic double bond in a side chain. By using the binder resin which has a double bond for a side chain, since the photocurability of the composition for color filters obtained becomes high, resolution and adhesiveness can be improved further.

As means for introducing an ethylenic double bond into the binder resin, for example, the methods described in JP-A-50-34443, JP-A-50-34444, and the like, that is, a carboxyl group of the resin, a glycidyl group and an epoxycyclo The method of making the compound which has a hexyl group and a (meth) acryloyl group, and the method of making a acrylate etc. react with the hydroxyl group which resin has can be mentioned.

For example, (meth) glycidyl acrylate, allyl glycidyl ether, (alpha)-ethyl acrylate glycidyl, crawlonyl glycidyl ether, (iso) crotonic acid glycidyl ether, (3, 4- epoxycyclohexyl Binder resin which has an ethylenic double bond group in a side chain can be obtained by making compound, such as) methyl (meth) acrylate, (meth) acrylic acid chloride, and (meth) acrylic chloride, react with resin which has a carboxyl group or a hydroxyl group. It is especially preferable as binder resin to which alicyclic epoxy compounds, such as (3, 4- epoxycyclohexyl) methyl (meth) acrylate, were made to react.

Thus, when ethylenic double bond is introduce | transduced into resin which has a carboxylic acid group or a hydroxyl group previously, the compound which has ethylenic double bond in 2-50 mol%, Preferably 5-40 mol% of a carboxyl group and a hydroxyl group of resin. It is preferable to combine these.

The preferable range of the weight average molecular weight measured by GPC of these acrylic resin is 1,000-100,000. If the weight average molecular weight is less than 1,000, it is difficult to obtain a uniform coating film. If the weight average molecular weight is more than 100,000, developability tends to decrease. In addition, the range of preferable content of carboxylation is 5-200 by acid value. If the acid value is less than 5, it will not be dissolved in the alkaline developer, and if it exceeds 200, the sensitivity may decrease.

These binder resins are contained in the range of 10-80 weight% normally, Preferably it is 20-70 weight% in the total solid of the composition for color filters.

(b) monomers

The monomer is not particularly limited as long as it is a polymerizable low molecular compound, but a compound capable of addition polymerization having at least one ethylenic double bond (hereinafter referred to as an "ethylenic compound") is preferable. An ethylenic compound is a compound which has an ethylenic double bond like addition polymerization and hardening by the action of the photoinitiator system mentioned later, when the composition for color filters is irradiated with actinic light. In addition, the monomer in this invention means the concept corresponding to what is called a high molecular substance, and means the concept which also contains a dimer, a trimer, and an oligomer other than a narrow monomer.

As an ethylenic compound, For example, ester of unsaturated carboxylic acid, unsaturated carboxylic acid, and a monohydroxy compound, ester of an aliphatic polyhydroxy compound and unsaturated carboxylic acid, ester of an aromatic polyhydroxy compound and unsaturated carboxylic acid , Esters obtained by esterification of unsaturated carboxylic acids with polyhydric carboxylic acids and polyhydric hydroxy compounds such as aliphatic polyhydroxy compounds and aromatic polyhydroxy compounds, polyisocyanate compounds and (meth) acryloyl-containing compounds Ethylenic compounds etc. which have a urethane skeleton which made the hydroxy compound react are mentioned.

Examples of the unsaturated carboxylic acids include (meth) acrylic acid, maleic anhydride, crotonic acid, itaconic acid, fumaric acid, 2- (meth) acryloyloxyethylsuccinic acid, 2-acryloyloxyethyladipic acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, 2- (meth) acryloyloxyethyl maleic acid, 2- (meth) acryloyloxypropyl succinic acid , 2- (meth) acryloyloxypropyladipic acid, 2- (meth) acryloyloxypropylhydrophthalic acid, 2- (meth) acryloyloxypropylphthalic acid, 2- (meth) acryloyloxypropyl Maleic acid, 2- (meth) acryloyloxybutyl succinic acid, 2- (meth) acryloyloxybutyladipic acid, 2- (meth) acryloyloxybutylhydrophthalic acid, 2- (meth) acryloyl Oxybutylphthalic acid, 2- (meth) acryloyloxybutylmaleic acid (meth), acrylic acid to ε-caprolactone, β-propiolactone, γ-butylolactone, δ-ballet The monomer which added lactones, such as a rolactone, or the monomer which added acid (anhydride), such as (anhydride) succinic acid, (phthalic anhydride), (maleic anhydride), to hydroxyalkyl (meth) acrylate, etc. Can be mentioned. Especially, (meth) acrylic acid and 2- (meth) acryloyloxyethyl succinic acid are preferable, and (meth) acrylic acid is more preferable. These can also be used in multiple types.

As ester of an aliphatic polyhydroxy compound and an unsaturated carboxylic acid, ethylene glycol diacrylate, triethylene glycol diacrylate, trimethylol propane triacrylate, trimethylol ethane triacrylate, pentaerythritol diacrylate, pentaerythritol triacryl And acrylic acid esters such as pentaerythritol tetraacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, and glycerol acrylate. In addition, the methacrylic acid ester which provided the acrylic acid part of these acrylates to the methacrylic acid part, the itaconic acid ester instead of the itaconic acid part, the crotonic acid ester instead of the crotonic acid part, or the maleic acid ester instead of the maleic acid part etc. Can be mentioned.

As ester of an aromatic polyhydroxy compound and unsaturated carboxylic acid, hydroquinone diacrylate, hydroquinone dimethacrylate, resorcin diacrylate, resorcin dimethacrylate, pyrogallol triacrylate, etc. are mentioned.

The ester obtained by esterification of an unsaturated carboxylic acid, a polyhydric carboxylic acid, and a polyhydric hydroxy compound is not necessarily a single substance, but may be a mixture. Representative examples include condensates of acrylic acid, butyric acid and ethylene glycol, condensates of acrylic acid, maleic acid and diethylene glycol, condensates of methacrylic acid, terephthalic acid and pentaerythritol, condensates of acrylic acid, adipic acid, butanediol and glycerin, etc. Can be mentioned.

As an ethylenic compound which has a urethane frame which made the polyisocyanate compound and the (meth) acryloyl-group containing hydroxy compound react, Aliphatic diisocyanate, such as hexamethylene diisocyanate and trimethylhexamethylene diisocyanate; Alicyclic diisocyanates such as cyclohexane diisocyanate and isophorone diisocyanate; Aromatic diisocyanates such as triylene diisocyanate, diphenylmethane diisocyanate and the like, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 3-hydroxy (1,1,1-triacryloyloxymethyl And reactants with (meth) acryloyl group-containing hydroxy compounds such as propane and 3-hydroxy (1,1,1-trimethacryloyloxymethyl) propane.

In addition, as an example of the ethylenic compound used for this invention, Acrylamide, such as ethylene bisacrylamide; Allyl esters such as diallyl phthalate; Vinyl group containing compounds, such as divinyl phthalate, etc. are also useful.

The compounding ratio of these ethylenic compounds is 10-80 weight% normally in the total solid of the composition for color filters, Preferably it is 20-70 weight%.

(c) photopolymerization watches

When the composition for color filters contains an ethylenic compound as the monomer (b), a photopolymerization clock having a function of directly absorbing light or being photosensitized to cause a decomposition reaction or a hydrogen drawing reaction to generate a polymerization active radical. Is needed.

A photoinitiator is comprised with the system which uses additives, such as an accelerator, together with a polymerization initiator. As a polymerization initiator, the metalocene compound containing the titanocene compound of Unexamined-Japanese-Patent No. 59-152396, Unexamined-Japanese-Patent No. 61-151197, and Unexamined-Japanese-Patent No. 10-39503 are described, for example. N-aryl-α-amino acids such as hexaarylbiimidazole derivatives such as 2- (2'-chlorophenyl) -4,5-diphenylimidazole, halomethyl-s-triazine derivatives and N-phenylglycine And radical activators such as N-aryl-α-amino acid salts and N-aryl-α-amino acid esters. As the accelerator, for example, N, N-dialkylaminobenzoic acid alkyl esters such as N, N-dimethylaminobenzoic acid ethyl ester, 2-mercaptobenzothiazole, 2-mercaptobenzoxazole, and 2-mercaptobenzoimimi Mercapto compounds having heterocycles such as dozol, aliphatic polyfunctional mercapto compounds and the like. A polymerization initiator and an additive can also combine several types, respectively.

The compounding ratio of the photopolymerization clock is usually 0.1 to 30% by weight, preferably 0.5 to 20% by weight, more preferably 0.7 to 10% by weight in the total solids of the composition of the present invention. If the blending ratio is significantly low, sensitivity is lowered. On the contrary, if the blending ratio is significantly high, the solubility of the unexposed portion in the developer is lowered, and the development failure is easy to be induced.

(d) color materials

In order to use the light from the backlight as efficiently as possible as the colorant, the transmittance in the light emission wavelength of the corresponding phosphor of each pixel is made as high as possible in accordance with the light emission wavelengths of the red, green, and blue backlights. It is necessary to select so that the transmittance in the light emission wavelength is as low as possible.

In the first invention of the present application, in the selection of the colorant, in the case of a red pixel, the relative emission intensity I (λ _R ) normalized to the total emission intensity from the backlight in the main emission wavelength λ _R of the red phosphor and the spectral transmittance of the red color filter When the product of T ^R (λ _R ), I (λ _R ) × T ^R (λ _R ) is usually 0.01 or more, preferably 0.05 or more, and the main emission wavelength λ _G and the half width of the green phosphor are Δλ _G. , I (λ _n ) × T ^R (λ _n ) is usually 0.001 or less, preferably 0.005 or less, and blue in the wavelength range of λ _G −Δλ _G / 2 <λ _n <λ _G + Δλ _G / 2 When the main emission wavelength λ _B of the phosphor and its half width are Δλ _B , I (λ _n ) × T ^R (λ _n ) in the wavelength range of λ _B -Δλ _B / 2 <λ _n <λ _B + Δλ _B / 2 ) it is usually 0.001 or less, and preferably it is preferable to select a coloring material to be 0.0005 or less (I (λ _n) are around from the back light of a wavelength of λ _n Standardized relative to the emission intensity emission intensity, T ^R (λ _n) are being spectral transmittance of a red color filter having a wavelength of λ _n). In addition, I (λ _R ) × T ^R (λ _R ) is usually 0.9 or less, preferably 0.8 or less. I (λ _n ) × T ^R (λ _n ) is usually 1 × 10 ⁻⁸ or more in the wavelength range of λ _G −Δλ _G / 2 <λ _n <λ _G + Δλ _G / 2. I (λ _n ) × T ^R (λ _n ) is usually 1 × 10 ⁻⁸ or more in the wavelength range of λ _B −Δλ _B / 2 <λ _n <λ _B + Δλ _B / 2.

Similarly, in the case of a green pixel, the product of the normalized emission intensity I (λ _G ) from the backlight in the main emission wavelength λ _G of the green phosphor and the spectral transmittance T ^G (λ _G ) of the green color filter, I (λ) ^{_{G) × T G (λ G}} ) is 0.01 or more, preferably 0.015 or more, and, λ _R - I (λ _n) in the wavelength range _{Δλ R / 2 <λ n <} λ R + Δλ R / 2 × T ^G (λ _n ) is usually 0.01 or less, preferably 0.005 or less, and I (λ _n ) × T ^G in the wavelength range of λ _B −Δλ _B / 2 <λ _n <λ _B + Δλ _B / 2 It is preferable to select a color material so that (λ _n ) is usually 0.001 or less, preferably 0.0001 or less (T ^G (λ _n ) is the spectral transmittance of the green color filter having a wavelength λ _n ). In addition, I (λ _G ) × T ^G (λ _G ) is usually 0.9 or less, preferably 0.8 or less. I (λ _n ) × T ^G (λ _n ) is usually 1 × 10 ⁻⁸ or more in the wavelength range of λ _R −Δλ _R / 2 <λ _n <λ _R + Δλ _R / 2. I (λ _n ) × T ^G (λ _n ) is usually 1 × 10 ⁻⁸ or more in the wavelength range of λ _B −Δλ _B / 2 <λ _n <λ _B + Δλ _B / 2.

By selecting such a color material as a green pixel, it is possible to satisfy the above conditions (1) to (3).

Similarly, if it is a blue pixel, the product of luminous intensity I (λ _B ) normalized at the total emission intensity from the backlight in the main emission wavelength λ _B of the blue phosphor and the spectral transmittance T ^B (λ _B ) of the blue color filter, I ( λ _B ) × T ^B (λ _B ) is usually 0.01 or more, preferably 0.015 or more, and I (λ _n) in the wavelength range of λ _R −ΔR _R 2 −λ _n <λ _R + Δλ _R / 2. ) × T ^B (λ _n ) is usually 0.0001 or less, and I (λ _n ) × T ^B (λ _n ) in the wavelength range of λ _G −Δλ _G / 2 <λ _n <λ _G + Δλ _G / 2 It is preferable to select a color material so that it is usually 0.03 or less, preferably 0.02 or less (T ^B (λ _n ) is the spectral transmittance of the blue color filter having a wavelength λ _n ). In addition, I (λ _B ) × T ^B (λ _B ) is usually 0.9 or less, preferably 0.8 or less. I (λ _n ) × T ^B (λ _n ) is usually 1 × 10 ⁻⁸ or more in the wavelength range of λ _R −Δλ _R / 2 <λ _n <λ _R + Δλ _R / 2. I (λ _n ) × T ^B (λ _n ) is usually 1 × 10 ⁻⁸ or more in the wavelength range of λ _G −Δλ _G / 2 <λ _n <λ _G + Δλ _G / 2.

In the second invention, in the color material selection, if it is a red pixel, the relative emission intensity I (λ _R ) normalized at the total emission intensity from the backlight in the main emission wavelength λ _R of the red phosphor and the spectral transmittance of the red color filter Product of T ^R (λ _R ), I (λ _R ) × T ^R (λ _R ) ≧ 0.01, preferably I (λ _R ) × T ^R (λ _R ) ≧ 0.05, and is generally a green phosphor I (λ _n ) × T ^R (λ _n ) <0.007, preferably I (λ) at λ = 585 nm so that the sub-luminescence at wavelength 585 nm from the Tb-based phosphor used can be efficiently cut. _n ) × T ^R (λ _n ) ≤ 0.005. In addition, I (λ _R ) is usually in the range of 0.01 to 0.9, preferably 0.01 to 0.2, T ^R (λ _R ) is in the range of 0.6 to 0.99, and in the range of wavelength 615 nm to 700 nm, T ^R. It is preferable that (λ _n ) / T ^R (585)> 8, in particular T ^R (λ _n ) / T ^R (585)> 10. In addition, I (λ _R ) × T ^R (λ _R ) is usually 0.9 or less, preferably 0.8 or less. Usually, in λ = 585 nm, 1 × 10 ⁻⁸ <I (λ _n ) × T ^R (λ _n ).

Further, when the main emission wavelength λ _G of the green phosphor and its half width are Δλ _G , I (λ _n ) × T ^{R in} the wavelength range of λ _G −Δλ _G / 2 <λ <λ _G + Δλ _G / 2 When (λ _n ) is usually 0.005 or less, preferably 0.001 or less, and the main light emission wavelength λ _B of the blue phosphor and its half width are Δλ _B , λ _B −Δλ _B / 2 <λ _n <λ _B + Δλ _In the wavelength range of _B / 2, it is preferable to select a color material such that I (λ _n ) × T ^R (λ _n ) is usually 0.005 or less, preferably 0.001 or less (I (λ _n ) is the wavelength λ _n The relative luminous intensity, T ^R (λ _n ), normalized to the total luminous intensity from the backlight in, is the spectral transmittance of the red color filter of the same wavelength λ _n ). In _{addition, λ G - Δλ G / 2} <λ n <λ G + Δλ G / I (λ n) in the wavelength range of 2 × T ^R (λ _n) used is usually 1 × 10 ^-8 or more. In the wavelength range of lambda _B -Δλ _B / 2 <λ _n <λ _B + Δλ _B / 2, I (λ _n ) × T ^R (λ _n ) is usually 1 × 10 ⁻⁸ or more.

Similarly, in the case of a green pixel, the product of the luminous intensity I (λ _G ) normalized at the total emission intensity from the backlight at the main emission wavelength λ _G of the green phosphor and the spectral transmittance T ^G (λ _G ) of the green color filter, I ( ^{_{λ G) × T G (λ}} G) is usually 0.01 or more, preferably 0.015 or more, _{and, λ R - Δλ R / 2} <λ n <λ R + Δλ R / 2 I (λ n at a wavelength range of ) X T ^G (λ _n ) is usually 0.01 or less, preferably 0.005 or less, and I (λ _n ) x in the wavelength range of λ _B -Δλ _B / 2 <λ _n <λ _B + Δλ _B / 2 It is preferable to select a colorant so that T ^G (λ _n ) is usually 0.005 or less, preferably 0.001 or less (T ^G (λ _n ) is the spectral transmittance of the green color filter having a wavelength λ _n ). In addition, I (λ _G ) × T ^G (λ _G ) is usually 0.9 or less, preferably 0.8 or less. In the wavelength range of λ _R -Δλ _R / 2 <λ _n <λ _R + Δλ _R / 2, I (λ _n ) × T ^G (λ _n ) is usually 1 × 10 ⁻⁸ or more. I (λ _n ) × T ^G (λ _n ) is usually 1 × 10 ⁻⁸ or more in the wavelength range of λ _B −Δλ _B / 2 <λ _n <λ _B + Δλ _B / 2.

By selecting such a color material as the green pixel, it is possible to satisfy the above conditions (1) to (3) of the first invention.

Similarly, if it is a blue pixel, it is preferable to select the same color material as 1st invention.

The colorant used in the present invention is not particularly limited and is appropriately selected to satisfy the above conditions. Examples of the colorant include organic pigments, inorganic pigments, dyes, and natural pigments. Organic pigments are preferable from the viewpoints of heat resistance and light resistance, and two or more kinds of pigments may be combined as necessary.

As pigments, various inorganic pigments are added to organic pigments such as azo, phthalocyanine, quinacridone, benzimidazolone, isoindolin, dioxazine, indasrone, perylene, and diketopyrrolopyrrole. Also available.

Specifically, the pigment of the pigment number shown below can be used, for example. In addition, following "C.I. Pigment Red 2 "or the like means a color index (C.I).

Red colorant: C.I. Pigment Red 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 14, 15, 16, 17, 21, 22, 23, 31, 32, 37, 38, 41, 47, 48 , 48: 1, 48: 2, 48: 3, 48: 4, 49, 49: 1, 49: 2, 50: 1, 52: 1, 52: 2, 53, 53: 1, 53: 2, 53 : 3, 57, 57: 1, 57: 2, 58: 4, 60, 63, 63: 1, 63: 2, 64, 64: 1, 68, 69, 81, 81: 1, 81: 2, 81 : 3, 81: 4, 83, 88, 90: 1, 101, 101: 1, 104, 108, 108: 1, 109, 112, 113, 114, 122, 123, 144, 146, 147, 149, 151 , 166, 168, 169, 170, 172, 173, 174, 175, 176, 177, 178, 179, 181, 184, 185, 187, 188, 190, 193, 194, 200, 202, 206, 207, 208 , 209, 210, 214, 216, 220, 221, 224, 230, 231, 232, 233, 235, 236, 237, 238, 239, 242, 243, 245, 247, 249, 250, 251, 253, 254 , 255, 256, 257, 258, 259, 260, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276

Blue colorant: C.I. Pigment Blue 1, 1: 2, 9, 14, 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 17, 19, 25, 27, 28, 29, 33 , 35, 36, 56, 56: 1, 60, 61, 61: 1, 62, 63, 66, 67, 68, 71, 72, 73, 74, 75, 76, 78, 79

Green colorant: C.I. Pigment Green 1, 2, 4, 7, 8, 10, 13, 14, 15, 17, 18, 19, 26, 36, 45, 48, 50, 51, 54, 55

Yellow colorant: C.I. Pigment Yellow 1, 1: 1, 2, 3, 4, 5, 6, 9, 10, 12, 13, 14, 16, 17, 24, 31, 32, 34, 35, 35: 1, 36, 36 : 1, 37, 37: 1, 40, 41, 42, 43, 48, 53, 55, 61, 62, 62: 1, 63, 65, 73, 74, 75, 81, 83, 87, 93, 94 , 95, 97, 100, 101, 104, 105, 108, 109, 110, 111, 116, 119, 120, 126, 127, 127: 1, 128, 129, 133, 134, 136, 138, 139, 142 , 147, 148, 150, 151, 153, 154, 155, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 172, 173, 174, 175 , 176, 180, 181, 183, 184, 185, 188, 189, 190, 191, 191: 1, 192, 193, 194, 195, 196, 197, 198, 199, 200, 202, 203, 204, 205 , 206, 207, 208

Orange colorant: C.I. Pigment Orange 1, 2, 5, 13, 16, 17, 19, 20, 21, 22, 23, 24, 34, 36, 38, 39, 43, 46, 48, 49, 61, 62, 64, 65 , 67, 68, 69, 70, 71, 72, 73, 74, 75, 77, 78, 79

Violet colorant: C.I. Pigment Violet 1, 1: 1, 2, 2: 2, 3, 3: 1, 3: 3, 5, 5: 1, 14, 15, 16, 19, 23, 25, 27, 29, 31, 32 , 37, 39, 42, 44, 47, 49, 50

Brown Color: C.I. Pigment Brown 1, 6, 11, 22, 23, 24, 25, 27, 29, 30, 31, 33, 34, 35, 37, 39, 40, 41, 42, 43, 44, 45

Black color material: C.I. Pigment Black 1, 31, 32

Of course, other color materials can be used.

Examples of the dyes include azo dyes, anthraquinone dyes, phthalocyanine dyes, quinoneimine dyes, quinoline dyes, nitro dyes, carbonyl dyes, and methine dyes.

As an azo dye, it is C.I. Acid Yellow 11, C.I. Acid Orange 7, C.I. Acid Red 37, C.I. Acid Red 180, C.I. Acid Blue 29, C.I. Direct 28, C.I. Direct 83, C.I. Direct Yellow 12, C.I. Direct Orange 26, C.I. Direct Green 28, C.I. Direct Green 59, C.I. Reactive Yellow 2, C.I. Reactive red 17, C.I. Reactive Red 120, C.I. Reactive Black 5, C.I. Disperse Orange 5, C.I. Disperse Red 58, C.I. Disperse Blue 165, C.I. Basic Blue 41, C.I. Basic Red 18, C.I. Mordant Red 7, C.I. Mordant Yellow 5, C.I. Mordant black 7;

As an anthraquinone type dye, it is C.I. Bat Blue 4, C.I. Acid Blue 40, C.I. Acid Green 25, C.I. Reactive Blue 19, C.I. Reactive Blue 49, C.I. Disperse Red 60, C.I. Disperse Blue 56, C.I. Disperse Blue 60 etc. are mentioned.

In addition, as a phthalocyanine dye, it is C.I. Pat Blue 5 and the like are quinoneimine dyes, for example, C.I. Basic Blue 3, C.I. Basic blue 9 and the like are quinoline dyes, for example, C.I. Solvent Yellow 33, C.I. Acid Yellow 3, C.I. Disperse yellow 64 and the like are, for example, C.I. Acid Yellow 1, C.I. Acid Orange 3, C.I. Disperse yellow 42 etc. are mentioned.

In addition, as a color material which can be used for the composition for color filters, inorganic color materials, for example, barium sulfate, lead sulfate, titanium oxide, yellow lead, bengar, chromium oxide, carbon black, etc. are used.

As a pigment used for formation of the green pixel of the color liquid crystal display device of 1st invention of this application, an isoindolinone pigment is preferable and especially, P.Y.139 is especially preferable.

Moreover, it is preferable to use these color materials by disperse | distributing to an average particle diameter of 1 micrometer or less, Preferably it is 0.5 micrometer or less, More preferably, it is 0.25 micrometer or less.

These color materials are contained in the range of 5 to 60 weight% normally, Preferably it is 10 to 50 weight% in the total solid of the composition for color filters.

(e) other ingredients

To the composition for color filters, further additives, such as a thermal polymerization inhibitor, a plasticizer, a storage stabilizer, a surface protective agent, a leveling agent, and an application aid, can be added as needed.

As the thermal polymerization initiator, for example, hydroquinone, p-methoxyphenol, pyrogallol, caticol, 2,6-t-butyl-p-cresol, β-naphthol and the like are used. It is preferable that the compounding quantity of a thermal polymerization inhibitor is the range of 0 to 3 weight% with respect to the total solid of a composition.

As the plasticizer, for example, dioctyl phthalate, didodecyl phthalate, triethylene glycol dicaprylate, dimethyl glycol phthalate, tricredyl phosphate, dioctyl adipate, dibutyl sebacate, triacetyl glycerine and the like are used. It is preferable that the compounding quantity of these plasticizers is 10 weight% or less with respect to the total solid of a composition.

Moreover, in the composition for color filters, the sensitizing dye according to the wavelength of an image exposure light source can be mix | blended for the purpose of improving a sensitivity.

Examples of these sensitizing dyes include xanthene dyes described in Japanese Patent Application Laid-open Nos. Hei 4-221958, 4-219756, and kmarin dyes having a heterocycle as described in Japanese Patent Application Laid-Open Nos. 3-239703 and 5-289335. , Japanese Patent Application Laid-Open No. 3-239703, 3-ketocoumarin compound described in Japanese Patent Application Laid-Open No. 5-289335, pyromethine dyes described in Japanese Patent Application Laid-open No. Hei 6-19240, and others; 2528, 54-155292, Japanese Patent Publication No. 45-37377, Japanese Patent Application Publication No. 48-84183, 52-112681, 58-15503, 60-88005, 59-56403 Japanese Patent Laid-Open No. Hei 2-69, Japanese Patent Laid-Open No. 57-168088, Japanese Patent Laid-Open No. 5-107761, Japanese Patent Laid-Open No. 5-210240, Japanese Patent Laid-Open No. 4-288818 The pigment | dye which has the dialkylamino benzene skeleton of description, etc. are mentioned.

Preferred of these sensitizing dyes are amino group-containing sensitizing dyes, more preferably compounds having an amino group and a phenol group in the same molecule. Especially preferred are, for example, 4,4'-bis (dimethylamino) benzophenone, 4,4'-bis (diethylamino) benzophenone, 2-aminobenzophenone, 4-aminobenzophenone, 4,4 Benzophenone compounds such as' -diaminobenzophenone, 3,3'-diaminobenzophenone and 3,4-diaminobenzophenone; 2- (p-dimethylaminophenyl) benzoxazole, 2- (p-diethylaminophenyl) benzooxazole, 2- (p-dimethylaminophenyl) benzo [4,5] benzoxazole, 2- (p -Dimethylaminophenyl) benzo [6,7] benzoxazole, 2,5-bis (p-diethylaminophenyl) 1,3,4-oxazole, 2- (p-dimethylaminophenyl) benzothiazole, 2- (p-diethylaminophenyl) benzothiazole, 2- (p-dimethylaminophenyl) benzimidazole, 2- (p-diethylaminophenyl) benzimidazole, 2,5-bis (p-di Ethylaminophenyl) 1,3,4-thiadiazole, (p-dimethylaminophenyl) pyridine, (p-diethylaminophenyl) pyridine, (p-dimethylaminophenyl) quinoline, (p-diethylaminophenyl) P-dialkylaminophenyl group-containing compounds such as quinoline, (p-dimethylaminophenyl) pyrimidine and (p-diethylaminophenyl) pyrimidine. Most preferable among these is 4,4'- dialkylamino benzophenone.

The compounding ratio of the sensitizing dye is usually 0 to 20% by weight, preferably 0.2 to 15% by weight, more preferably 0.5 to 10% by weight in the total solids of the color filter composition.

In addition, the composition for color filters can be appropriately further added an adhesion promoter, a coating agent, a developer, and the like.

The composition for color filters may be used after being dissolved in a solvent in order to dissolve additives such as viscosity adjustment and photopolymerization clock.

What is necessary is just to select a solvent suitably according to the component of composition, such as (a) binder resin and (b) monomer, For example, diisopropyl ether, mineral spirit, n-pentane, amyl ether, ethyl caprylate, n -Hexane, diethyl ether, isoprene, ethyl isobutyl ether, butyl stearate, n-octane, barusol # 2, afco # 18 solvent, diisobutylene, amyl acetate, butyl acetate, afcosine, butyl ether , Diisobutyl ketone, methylcyclohexene, methylnonyl ketone, propyl ether, dodecane, soical solvent Nos. 1 and 2, amyl formate, dihexyl ether, diisopropyl ketone, sorbetho # 150, (n butyl acetate, hexene, shell TS28 solvent, butyl chloride, ethyl amyl ketone, ethyl benzoate, amyl chloride, ethylene glycol diethyl ether, ethyl orthoformate, methoxymethylpentanone, methyl butyl ketone, Methyl Hexyl Ketone, Methyl Isobutyl Yate, benzonitrile, ethyl propionate, methyl cellosolve acetate, methyl isoamyl ketone, methyl isobutyl ketone, propyl acetate, amyl acetate, amyl formate, bicyclohexyl, diethylene glycol monoethyl ether acetate, diphene Ten, methoxymethylpentanol, methyl amyl ketone, methyl isopropyl ketone, propyl propionate, propylene glycol-t-butyl ether, methyl ethyl ketone, methyl cellosolve, ethyl cellosolve, ethyl cellosolve acetate, Carbitol, cyclohexanone, ethyl acetate, propylene glycol, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether, propylene glycol monoethyl ether acetate, dipropylene glycol monoethyl ether, dipropylene glycol mono Methyl ether, dipropylene glycol monomethyl ether acetate, 3-methoxy Lopionic acid, 3-ethoxypropionic acid, 3-ethoxypropionate, methyl 3-ethoxypropionate, 3-methoxypropionate, 3-methoxypropionate, 3-methoxypropionic acid propyl, 3-methoxypropionic acid Butyl, diglyme, ethylene glycol acetate, ethyl carbitol, butyl carbinol, ethylene glycol monobutyl ether, propylene glycol-t-butyl ether, 3-methyl-3-methoxybutanol, tripropylene glycol methyl ether, 3-methyl 3-methoxybutyl acetate etc. are mentioned. These solvent can also be used in combination of 2 or more type.

Solid content concentration in the coloring composition for color filters is suitably selected according to the coating method to apply. In spincoats, slits & spincoats, and diecoats which are widely used in the manufacture of color filters at present, the range of 1 to 40% by weight, preferably 5 to 30% by weight, is appropriate.

The combination of solvents is selected in consideration of the dispersion stability of the pigment, the solubility in soluble components in solid content such as resins, monomers, photopolymerization initiators, dryness at the time of coating, and drying in a reduced pressure drying process.

The composition for color filters using the said compounding component is manufactured as follows, for example.

First, a color material is disperse | distributed and adjusted to the state of ink. The dispersion treatment is performed using a paint conditioner, sand grinder, ball mill, roll mill, stone mill, jet mill, homogenizer and the like. Since the color regeneration fine particles are formed by the dispersion treatment, an improvement in the transmittance of the transmitted light and an improvement in the coating property are achieved.

The dispersion treatment is preferably carried out in a system in which a colorant and a solvent are suitably used together with a binder resin having a dispersing function, a dispersant such as a surfactant, a dispersing aid and the like. In particular, the use of a polymer dispersant is preferred because of its excellent dispersion stability over time.

For example, when dispersing using a sand grinder, it is preferable to use glass beads or zirconia beads of 0.1 to several millimeters in diameter. The temperature at the time of dispersion | distribution process is set in the range of 0 degreeC-100 degreeC normally, Preferably it is room temperature-80 degreeC. The dispersion time is appropriately adjusted because the appropriate time varies depending on the composition of the ink (colorant, solvent, dispersant) and the apparatus specifications of the sand grinder.

Next, a binder resin, a monomer, a polymerization starter, and the like are mixed with the colored ink obtained by the dispersion treatment to obtain a uniform solution. In addition, in each process of dispersion | distribution processing and mixing, since a fine foreign material often mixes, it is preferable to filter-process the solution obtained by the filter etc.

As a color filter composition used for formation of the green pixel of the color filter which comprises the color liquid crystal display device of 1st invention of this application, (a) binder resin and / or (b) monomer, (c) photopolymerization clock, (d A photosensitive colored resin composition containing a colorant, wherein (d) an isoindolinone-based pigment is contained as a colorant, and the average transmittance of 500 to 530 nm when applied at a film thickness of 2.5 μm is 20% or more and 80% or less. The photosensitive coloring resin composition made into is preferable. Among the isoindolinone pigments, P. Y. 139 is particularly preferably used. The method of measuring the average transmittance of 500 to 530 nm when the film thickness of the color filter composition is applied at 2.5 μm is known in the known methods such as spin coater, bar coater and die coater. After coating, the film was dried on a transparent substrate such as a glass substrate so as to have a dry film thickness of 2.5 μm, and the whole surface of the substrate was irradiated with ultraviolet rays of 100 mJ / cm 2, developed with an alkaline developer, and then oven at 230 ° C. for 30 minutes. The sample for measurement was prepared by post-baking at, and spectroscopy on the transparent substrate alone measured before application using a commercially available spectrophotometer (eg, Hitachi manufactured U-3500, U-4100, etc.). The transmittance is measured as a relative value with reference (100%). Thus, the specific transmittance was numerically averaged to 500-530 nm, and it was set as the average transmittance. In such a photosensitive colored resin composition, the average transmittance of 500 to 530 nm when applied at a film thickness of 2.5 μm is preferably 30% or more, preferably 70% or less.

[Production method of color filter]

The color filter according to the present invention can be produced by forming red, green, and blue pixel images on a transparent substrate provided with a black matrix.

The material of the transparent substrate is not particularly limited. Examples of the material include polyester such as polyethylene terephthalate, polyolefin such as polypropylene and polyethylene, polycarbonate, polymethyl methacrylate, thermoplastic plastic sheet of polysulfone, epoxy resin, unsaturated polyester resin, and poly (meth) acrylic Thermosetting plastic sheets, such as resin, or various glass plates, etc. are mentioned. Among these, glass plates and heat resistant plastics are preferable in terms of heat resistance.

The transparent substrate may be subjected to corona discharge treatment, ozone treatment, thin film treatment of various polymers such as a silane coupling agent or a urethane polymer, and the like in advance in order to improve physical properties such as surface adhesion.

The black matrix is formed on a transparent substrate using a metal thin film or a pigment dispersion for black matrix.

The black matrix using the metal thin film is formed by, for example, a single layer of chromium or two layers of chromium and chromium oxide. In this case, first, a thin film of these metals or metal-metal oxides is formed on the transparent substrate by vapor deposition, sputtering, or the like. Subsequently, after forming a photosensitive film on it, the photosensitive film is exposed and developed using the photomask which has a repeating pattern, such as a stripe, a mosaic, and a triangle, and a resist image is formed. Thereafter, the thin film is etched to form a black matrix.

When using the pigment dispersion for black matrices, a black matrix is formed using the composition for color filters containing a black color material as a color material. For example, red, green, blue, etc. suitably selected from black materials such as carbon black, bone black, graphite, iron black, aniline black, cyanine black, titanium black, or a plurality of uses, or inorganic or organic pigments or dyes. Using the composition for color filters containing the black color material by mixing, the black matrix is formed in the same manner as the method of forming the following red, green, and blue pixel images.

After coating and drying the above-mentioned composition for color filters having a color material of red, green, and blue on a transparent substrate on which a black matrix is formed, a photomask is placed on this coating film, and image exposure is performed through this photomask. Then, a pixel image is formed by thermosetting or photocuring and developing a colored layer as necessary. This operation is performed with respect to the composition for color filters of three colors of red, green, and blue, respectively, and a color filter image is formed.

Application of the composition for color filters can be performed by application apparatuses, such as a spinner, a wire bar, a flow coater, a die coater, a roll coater, and a spray.

Drying after application can be performed using a hotplate, an IR oven, a convection oven, or the like. The higher the drying temperature is, the higher the adhesion to the transparent substrate is. However, when the drying temperature is too high, the photopolymerization clock decomposes, which tends to cause thermal polymerization, leading to poor development. Therefore, the drying temperature is usually 50 to 200 ° C, preferably 50 to 150 ° C. Range. The drying time is usually in the range of 10 seconds to 10 minutes, preferably 30 seconds to 5 minutes. In addition, before drying by these heat, the drying method by pressure reduction can also be applied.

The film thickness of the coating film after drying is 0.5-3 micrometers normally, Preferably it is the range of 1-2 micrometers.

Moreover, when the composition for color filters to use uses binder resin and ethylenic compound together, and binder resin is acrylic resin which has an ethylenic double bond and a carboxyl group in a side chain, since this is very sensitive and high resolution, It is preferable because an image can be formed by exposure and development without forming an oxygen barrier layer such as polyvinyl alcohol.

The exposure light source that can be applied to image exposure is not particularly limited, but for example, xenon lamp, halogen lamp, tungsten lamp, high pressure mercury lamp, ultra high pressure mercury lamp, metal halide lamp, medium pressure mercury lamp, low pressure mercury lamp, carbon arc, fluorescent lamp, etc. Lamp light sources, laser light sources such as argon ion lasers, YAG lasers, excimer lasers, nitrogen lasers, helium cadmium lasers, and semiconductor lasers. When only a specific wavelength is used, an optical filter can also be used.

After image exposure is performed with such a light source, an image can be formed on a substrate by developing using an organic solvent or an aqueous solution containing a surfactant and an alkali agent. The aqueous solution may further contain an organic solvent, a buffer, a dye or a pigment.

Although there is no restriction | limiting in particular about a developing method, Usually, the method of immersion development, spray development, brush development, ultrasonic development, etc. is used at the development temperature of 10-50 degreeC, Preferably it is 15-45 degreeC.

As an alkali chemicals used for image development, inorganic alkali chemicals, such as sodium silicate, potassium silicate, sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium triphosphate, dibasic sodium phosphate, sodium carbonate, potassium carbonate, sodium bicarbonate, or trimethylamine, Organic amines such as diethylamine, isopropylamine, n-butylamine, monoethanolamine, diethanolamine, triethanolamine, tetraalkylammonium hydroxide, and the like, and these may be used alone or in combination of two or more thereof. Can be used.

As surfactant, Nonionic surfactant, such as polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene alkyl ester, sorbitan alkyl ester, monoglyceride alkyl ester, etc .; Anionic surfactants such as alkyl benzene sulfonates, alkyl naphthalene sulfonates, alkyl sulfates, alkyl sulfonates and sulfosuccinic ester salts; Surfactants, such as alkylbetaines and amino acids, can be used.

When the organic solvent is used alone or in combination with an aqueous solution, for example, isopropyl alcohol, benzyl alcohol, ethyl cellosolve, butyl cellosolve, phenyl cellosolve, propylene glycol, diacetone alcohol, etc. may be used. Can be.

According to the first invention of the present application, the spectral transmittance at wavelength λ nm (wavelength every 5 nm of the visible region of 380 to 780 nm) by the green pixel of the color filter manufactured in this way is T ^G (λ _n ), backlight. is the relative light emission intensity normalized by the total light emission intensity at the wavelength λ _n ㎚ from I (λ _n)

(1) 500㎚ <The method according to any one of the wavelength of λ _n <530㎚

I (λ _n ) × T ^G (λ _n )> 0.01

(2) 610㎚ <a wavelength region of λ _n <650㎚

I (λ _n ) × T ^G (λ _n ) <0.0001

(3) 400㎚ <a wavelength region of λ _n <450㎚

I (λ _n ) × T ^G (λ _n ) <0.0001

Satisfies the formula, and is preferably represented by the following general formula (4)

M ^II _1-x Eu _x O.a (Mg _1-y Mn _y ) O.bAl ₂ O ₃ (4)

(Herein, M ^II represents at least one atom selected from the group consisting of Ba, Sr and Ca, and a, b, x, y are real numbers that satisfy the following inequality).

0.8 ≤ a ≤ 1.2

4.5 ≤ b ≤ 5.5

0.05 ≤ x ≤ 0.3

0.02 ≤y ≤0.5)

By using a compound containing a compound represented by the above, a color liquid crystal display device having an ultra-high-purity purity of 80% or more, even 90% or more, and 95% or more can be realized.

According to the second aspect of the invention, the spectral transmittance at λ _n nm (wavelength every 5 nm of the visible region) of the color filter manufactured as described above is set at T ^R (λ _n ) and the wavelength λ _n nm from the backlight. The relative luminous intensity standardized to the total luminous intensity of I (λ _n ) is

(5) at a wavelength of any one of 615 nm ≤ λ _n ≤ 700 nm

I (λ _n ) × T ^R (λ _n ) ≥0.01

(6) at λ _n = 585 nm

I (λ _n ) × T ^R (λ _n ) <0.007

Satisfies, and preferably also,

(7) at a wavelength of any of 615 nm ≤ λ _n ≤ 650 nm

T ^R (λ _n ) / T ^R (585)> 8

YVO ₄ : Eu ³⁺ -based phosphor, Y (P, V) O ₄ : Eu ³⁺ -based phosphor, and 3.5MgO.0.5MgF ₂ .GeO ₂ : Mn ⁴⁺ -based phosphor. A phosphor layer or phosphor film containing one or two or more selected from the group consisting of GaAsP-based LEDs, and more preferably YVO ₄ : Eu ³⁺ -based phosphor, Y (P, V) O ₄ : a phosphor layer or phosphor film containing one or two or more selected from the group consisting of ₄ : Eu ^{3 +} -based phosphors and 3.5MgO.0.5MgF ₂ .GeO ₂ : Mn ⁴⁺ -based phosphors; More preferably, the spectral transmittance at wavelength [lambda] _n nm by the green pixel of the color filter is defined as the relative luminous intensity at the total emission intensity at T ^G ([lambda] _n ) and the wavelength [lambda] _n nm from the backlight. (λ _n) are the first by satisfying the (1) to (3) of the first invention, NTSC ratio 70% or more, and further 80% or more seconds in order gosaek Of the color liquid crystal display device it can be realized.

Example

Next, although an Example, an Example, and a comparative example demonstrate this invention further more concretely, this invention is not limited to a following example, unless the summary is exceeded. In addition, in a following example, "part" shows a "weight part."

Preparation Example 1 Backlight Preparation

52 parts of Y ₂ O ₃ : Eu (trade name "LP-RE1" available from Kasei Optonix Co., Ltd.) as a red phosphor, BaMgAl ₁₀ of Ba _0.9 Eu _0.1 O. (Mg _0.79 Mn _0.21 ) O.5Al ₂ O ₃ as a green phosphor. O ₁₇ : 18 parts of Eu, Mn (trade name "LP-G3" made by Kaysei Optonics Co., Ltd.), and 30 parts of BaMgAl ₁₀ O ₁₇ : Eu (brand name "LP-B4" by Kaysei Optonics Co., Ltd.) to butyl acetate After fully mixing with lacquer of cellulose, a fluorescent substance slurry was produced, and it apply | coated to the inner surface of the glass tube of 2.3 mm of tube diameters, and dried, and baked at 620 degreeC for 5 minutes. Thereafter, a cold cathode tube for backlight was obtained in the usual procedures such as mounting of the electrode, evacuation, Hg and gas introduction, and sealing.

Next, as the light guide plate, a wedge-shaped cyclic polyolefin-based resin plate (Nippon Zeon trade name "Zenooa") having a size of 289.6 x 216.8 mm, a thickness of 2.0 mm, a thickness of 0.6 mm, and a thickness change in the short side direction was used. A linear light source consisting of the cold cathode tube at the thick side of the thick side, and then covering the cold cathode tube with a reflector ("silver reflector plate" manufactured by Misui Chemical Co., Ltd.) as a light reflection surface. The emitted light source from the linear light source was efficiently incident on the thick side (light incidence plane) of the.

On the surface facing the light exit surface of the light guide, a fine circular pattern consisting of a rough surface whose diameter gradually increases as it falls from the linear light source is transferred and patterned from the mold. The diameter of the roughening pattern is 130 μm in the vicinity of the light source, and gradually increases as it is separated from the light source, and is 230 μm in the farthest place.

Here, the metal mold | die used for formation of the rough circular pattern which consists of a rough surface laminates the dry film resist of thickness 50micrometer on a SUS board | substrate, forms an opening part in the part corresponding to this pattern by photolithography, and again this metal mold | die Was obtained by peeling a dry film resist after uniformly blasting at a projection pressure of 0.3 MPa with a # 600 spherical glass bead by the sandblasting method.

In addition, a triangular prism array having a right angle of 90 ° and a pitch of 50 μm is installed on the light exit surface of the light guide so that the ridge line is substantially perpendicular to the light entrance surface of the light guide, and improves the light condensation of the light beam emitted from the light guide. It was made into a structure. The metal mold | die used for formation of the light-converging element array which consists of a triangular prism array was obtained by the process of scraping a stainless steel board | substrate which performed M nickel electroless plating by single crystal diamond bite.

A light reflecting sheet (manufactured by Toray Industries, Inc. (Lumira E60L)) is provided on the side facing the light exit surface of the light guide, a light diffusion sheet is provided on the light exit surface, and 90 ° on a light diffusion sheet and a pitch of 50 is used. The sheet | seat ("BEFIII" by Sumitomo 3M) in which the triangular prism array which consists of micrometers was formed was made so that the ridgelines of each of two prism sheets may be orthogonal, and the backlight was obtained.

Preparation Example 2 Preparation of Backlight ②

As a red phosphor, 40 parts by weight of YVO ₄ : Eu ^{3 +} -based phosphor (trade name "MGV-620" manufactured by Kasei Optonix Co., Ltd.), LaPO ₄ : Ce, Tb phosphor (trade name "LP-G2" manufactured by Kasei Optotronics Co., Ltd.) ) 22 parts by weight and a blue cold cathode tube were obtained in the same manner as in Production Example 1, except that 38 parts by weight of BaMgAl ₁₀ O ₁₇ : Eu (trade name "LP-B4" manufactured by Kasei Optonix Co., Ltd.) was used. In the same manner as in the above, it was processed with backlight ②. The relative light emission spectrum of the obtained backlight is shown in FIG. 6.

The main emission wavelength of this backlight ② was red: about 620 nm, blue: about 450 nm, green: about 545 nm.

Preparation Example 3 Preparation of Backlight ③

40 parts by weight of YVO ₄ : Eu ³⁺ -based phosphor (trade name "MGV-620" manufactured by Kasei Optonix Co., Ltd.) as a red phosphor, and a composition as a green phosphor Ba _0.9 Eu _0.1 O. (Mg _0.79 Mn _0.21 ) O.5Al ₂ O ₃ 22 parts by weight of BaMgAl ₁₀ O ₁₇ : Eu, Mn (trade name "LP-G3" manufactured by Kasei-Optronics Co., Ltd.), 38 weights of BaMgAl ₁₀ O ₁₇ : Eu (trade name "LP-B4" manufactured by Kasei-Optronics Company) Except having used parts, it carried out similarly to manufacture example 1 and obtained the cold cathode tube for backlights, and processed it to backlight (3) similarly to manufacture example 1. The relative light emission spectrum of the obtained backlight is shown in FIG. 7.

The main emission wavelength of this backlight ③ was red: about 620 nm, blue: about 450 nm, green: about 515 nm.

Preparation Example 4 Preparation of Backlight ④

A cold cathode tube for a backlight was obtained in the same manner as in Production Example 1 except that LaPO ₄ : Ce and Tb phosphors (trade name "LP-G2" manufactured by Kasei-Optronics Co., Ltd.) were used as green phosphors. Processed. The relative light emission spectrum of the obtained backlight is shown in FIG. 3.

Preparation Example 5 Preparation of Binder Resin

20 parts of styrene-acrylic acid resins having an acid value of 200, a weight average molecular weight of 5,000, 0.2 parts of p-methoxyphenol, 0.2 parts of dodecyltrimethylammonium chloride, and 40 parts of propylene glycol monomethyl ether acetate were placed in a flask (3, 4 -7.6 parts of epoxycyclohexyl) methyl acrylate was added dropwise and reacted at a temperature of 100 ° C for 30 hours. The reaction solution was reprecipitated in water and dried to obtain a resin. As a result of performing neutralization titration with KOH, the acid value of the resin was 80 mg-KOH / g.

Preparation Example 6 Preparation of Resist Solution

Each component shown below was combined at the following ratios, and it stirred until each component melt | dissolved completely by the stealer, and obtained the resist solution.

ㆍ Binder resin solution prepared in Production Example 5: 2.06 parts

ㆍ Defentaerythritol hexaacrylate: 0.21 parts

ㆍ photopolymerization watch

2- (2'-chlorophenyl) -4,5-diphenylimidazole: 0.06 parts

2-mercaptobenzothiazole: 0.02 parts

4,4'-bis (diethylamino) benzophenone: 0.04 parts

Solvent (propylene glycol monomethyl ether acetate): 5.41 parts

ㆍ Surfactant (FC-430, manufactured by Sumitomo 3M): 0.0003 parts

Preparation Example 7 Fabrication of Red Pixel A

Propylene glycol monomethyl ether acetate 75 parts, red pigment P.R. 254.17 parts and 8 parts of urethane dispersion resins were mixed, and it stirred for 3 hours with the stirrer, and prepared the mill base of 25 weight% of solid content concentration. This mill base was dispersed using a bead mill at a speed of 10 m / s and a residence time of 3 hours using 600 parts of 0.5 mmφ zirconia beads to obtain a dispersion ink of P.R.254.

In addition, the mill base was adjusted to the same composition as P.R.254 except that the pigment was changed to P.T.177, and the dispersion ink of P.R.177 was obtained by dispersing the residence time for 2 hours under the same dispersion conditions.

47 parts of PR254 ink, 25 parts of PR177 ink, and 28 parts of the resist solution prepared in Preparation Example 6 were mixed and stirred in the dispersion ink obtained as described above, and the solvent (propylene glycol was obtained so that the final solid concentration was 25% by weight. Monomethyl ether acetate) was added, and the composition for red color filters was obtained.

The obtained color filter composition was applied and dried on a 10 cm × 10 cm glass substrate (“AN635” manufactured by Asahi Glass Co., Ltd.) with a spin coater so as to have a dry film thickness of 2.5 μm. 100 mJ / cm <2> of ultraviolet-rays were irradiated to this board | substrate whole surface, and after image development with alkaline developing solution, it post-baked by oven at 230 degreeC for 30 minutes, and the red pixel sample for a measurement was produced.

Preparation Example 8 Fabrication of Red Pixel B

A composition for a red color filter was obtained in the same manner as in Production Example 7 except that 25 parts of PR254 ink and 17 parts of PR177 ink were used as the dispersion ink, and the same coating, drying, UV irradiation, alkali development, and postbaking were performed. The red pixel sample B for a measurement was produced.

Preparation Example 9 Preparation of Red Pixel C

Except having used 42 parts of PR254 ink and 12 parts of PR177 ink as dispersion ink, it carried out similarly to manufacture example 7, and obtained the composition for red color filters, and apply | coated, dried, UV irradiation, alkali development, and postbaking similarly. The red pixel sample C for a measurement was produced.

Preparation Example 10 Fabrication of Green Pixel A

A millbase was prepared in the same composition as P.R.254 in Preparation Example 7 except that the pigment was changed to P.G.36, and dispersion treatment was performed at the residence time for 1 hour under the same dispersion conditions to obtain a dispersion ink of P.G.36.

A millbase was prepared in the same composition as in Production Example 7 except that the pigment was changed to P.Y.150, and dispersion treatment was performed at the residence time of 2 hours under the same dispersion conditions to obtain a dispersion ink of P.Y.150.

A millbase was prepared in the same composition as in Production Example 7 except that the pigment was changed to P.Y.139, and dispersion treatment was performed at the residence time of 2 hours under the same dispersion conditions to obtain a dispersion ink of P.Y.139.

The dispersion ink obtained as described above was mixed and stirred with 33.5 parts of PG36 ink, 8.4 parts of PY150 ink, 9.0 parts of PY139 ink, and 66 parts of the resist solution prepared in Preparation Example 6, and the final solid concentration was 25 The solvent (propylene glycol monomethyl ether acetate) was added so that it might become weight%, and the composition for green color filters was obtained.

The composition for color filters obtained was apply | coated and dried on a 10 cmx10 cm glass substrate ("AN635" by Asahi Glass Co., Ltd.) with a spin coater so that a dry film thickness might be set to 2.5 micrometers. After irradiating 100 mJ / cm <2> ultraviolet-rays to this board | substrate whole surface, and developing with alkaline developing solution, it post-baked by oven at 230 degreeC for 30 minutes, and produced the green pixel sample A for a measurement.

Preparation Example 11 Fabrication of Green Pixel B

20.0 parts of PG36 ink and 6.9 parts of PY150 ink were used as the dispersing ink. Thus, in the same manner as in Production Example 10, a composition for a green color filter was obtained, and the same application, drying, UV irradiation, alkali development, and postbaking were performed. It carried out and produced the green pixel sample B for a measurement.

Preparation Example 12 Fabrication of Green Pixel C

A millbase was prepared in the same composition as P.R.254 in Production Example 7 except that the pigment was changed to P.Y.138, and dispersion treatment was performed at the residence time of 2 hours under the same dispersion conditions to obtain a dispersion ink of P.Y.138.

Further, in the same manner as in Production Example 10, a dispersion ink of P.G.36 was obtained.

The dispersion ink obtained as described above was obtained in the same manner as in Production Example 10 except that 22 parts of PG36 ink and 20 parts of PY138 ink were used to obtain a composition for a green color filter. And post-baking, the green pixel sample C for a measurement was produced.

Preparation Example 13 Fabrication of Blue Pixel A

A millbase was prepared with the same composition as in PR254 of Preparation Example 7 except that the pigment was changed to PG15: 6, and the dispersion ink was subjected to a dispersion time of 1 hour under the same dispersion conditions, thereby dispersing ink of PG15: 6. Got it.

In addition, the mill base was prepared by the same composition as P.R.254 of the manufacture example 7 except having changed the pigment into P.V.23, and it disperse | distributed in 2 hours of residence time on the same dispersion conditions, and obtained the dispersion ink of P.V.23.

The dispersion ink obtained as described above was mixed and stirred with 33.5 parts of PB15: 6 ink, 1.6 parts of PV23 ink, and 65 parts of the resist solution prepared in Preparation Example 6, so that the solvent had a final solid concentration of 25% by weight. (Propylene glycol monomethyl ether acetate) was added, and the composition for blue color filters was obtained.

The obtained color filter composition was applied and dried on a 10 cm × 10 cm glass substrate (“AN635” manufactured by Asahi Glass Co., Ltd.) with a spin coater so as to have a dry film thickness of 2.5 μm. After irradiating 100 mJ / cm <2> ultraviolet-rays to this board | substrate whole surface, and developing with alkaline developing solution, it post-baked in oven at 230 degreeC for 30 minutes, and produced the blue pixel sample A for a measurement.

Preparation Example 14 Fabrication of Blue Pixel B

A composition for a blue color filter was obtained in the same manner as in Production Example 13, except that 14 parts of PB15: 6 ink and 2.5 parts of PV23 ink were used as the dispersion ink, and the coating, drying, UV irradiation, alkali development, and postbaking were similarly performed. Was carried out and the blue pixel sample B for a measurement was produced.

Examples 1-3 and Comparative Examples 1-3

The cold cathode tube of the backlight of Table-1 was turned on by high frequency via the inverter ("HIU-742A" by Harison Toshiba Lighting Co., Ltd.), and the emission spectrum of the backlight was measured using "BM-5" by dopecon.

In addition, about the red pixel sample, the green pixel sample, and the blue pixel sample of Table-1, each transmittance spectrum was measured with the spectrophotometer ("U-3500" by Hitachi make).

The values of the conditions (1) to (3) were calculated from these data.

In addition, the red pixel sample, the green pixel sample, and the blue pixel sample were bonded to the backlight of which high frequency was turned on in the same manner as described above in the combination of Table-1, respectively, and the optical luminance measuring device (&quot; BM5A &quot; Chromaticity and luminance were measured and used as reference data.

These data correspond to the states of red, green, and monochromatic light emission in the liquid crystal display device in which the backlight and the color filter are combined, except that the brightness is about one third in the actual display device. In this way, the color reproduction range (NTSC ratio) and luminance of the liquid crystal display device can be calculated.

The results are shown in Table 1. (Circle) of Table 1 means satisfy | filling an expression, and x means not satisfying an expression.

In Table 1, the closer the green chromaticity (x, y) is to (0.21, 0.71), the higher the purity of the green and the more the depth is. In Examples 1-3 of this application, it turns out that chromaticity (0.21, 0.71) is achieved and the brightness is high (image is bright).

The average transmittance of 500 to 530 nm of the green pixels A and B manufactured in Production Examples 10 and 11 was calculated, as a result of 53.2% in green pixel A and 83.9% in green pixel B.

Moreover, as a result of exposing and developing the coating film of the composition for color filters of each color prepared by the said Production Examples 7-14 at 100 mJ / cm <2> using a test pattern mask, respectively, it was confirmed that a favorable pattern is obtained in all the samples.

Examples 4-5, Comparative Examples 4-5

The cold cathode tube of the backlight of Table 2 was turned on by a high frequency via an inverter ("HIU-742A" by Harrison Toshiba Line Co., Ltd.), and the emission spectrum of the backlight was measured using "BM-5" by Dopecon.

In addition, about the red pixel sample, the blue pixel sample, and the blue pixel sample of Table 2, each transmittance spectrum was measured with the spectrophotometer ("U-3500" by Hitachi Ltd.).

From these data, the value of said conditions (5)-(6) was computed.

In Example 4, it was confirmed that condition (5) was satisfied at lambda = 620 nm, and condition (7) was also satisfied at condition (6), and further, lambda = 620 nm.

I (620) = 8.23 × 10 ^-2

T ^R (620) = 0.903

I (620) × T ^R (620) = 7.43 × 10 ^-2

I (585) = 2.08 × 10 ^-2

T ^R (585) = 7.87 × 10 ^-2

I (585) × T ^R (585) = 1.64 × 10 ^-3

I (585) ÷ T ^R (585) = 11.5

In Example 5, it was confirmed that condition (5) was satisfied at λ = 620 nm, and condition (7) was also satisfied at condition (6), and further, λ = 620 nm.

I (620) = 6.55 × 10 ^-2

T ^R (620) = 0.87

I (620) × T ^R (620) = 5.70 × 10 ^-2

I (585) = 2.83 × 10 ^-3

T ^R (585) = 5.34 × 10 ^-2

I (585) × T ^R (585) = 1.51 × 10 ^-4

T ^R (620) ÷ T ^R (585) = 16.3

In addition, the red pixel sample, the green pixel sample, and the blue pixel sample were respectively bonded to the backlight of which high frequency was turned on in the same manner as described above in the combination of Table-2, and respectively by an optical luminance measuring device ("BM5A" manufactured by Dopecon). The chromaticity and luminance of were measured and set as basic data.

These data are in the states of red, green, and monochromatic light emission in the liquid crystal display device in which the backlight and the color filter are combined, except that the brightness is about 1/3 of the actual display device. This corresponds to the color reproduction range (NTSC ratio) and luminance of the liquid crystal display device.

The results are shown in Table 2. ○ in Table 2 means that the expression is satisfied, and × means that the expression is not satisfied.

In Table 2, the closer the red chromaticity (x, y) is to (0.67, 0.33), the deeper the purity of red is. In Examples 4-5 of this application, it turns out that chromaticity very close to chromaticity (0.67, 0.33) is achieved, and high luminance (image is bright).

Industrial availability

As described above, according to the color liquid crystal display device of the present invention, an optical shutter using liquid crystal, a color filter having at least three color elements of red, green, and blue corresponding to the optical shutter, and a backlight for transmission illumination are combined. In the color liquid crystal display device configured, the NTSC ratio is high by improving the light emission wavelength of the backlight and adjusting the spectral transmittance of the color filter, in particular, the spectral transmittance of the green pixel of the color filter in response to the light emission wavelength of the backlight. A color liquid crystal display device which realizes color purity can be easily provided.

Although this invention was demonstrated in detail using the specific aspect, it is clear for those skilled in the art for various changes and modification to be possible, without leaving | separating the intent and range of this invention.

In addition, this application is based on the JP Patent application (Japanese Patent Application No. 2002-254705) filed on August 30, 2002, and the Japanese patent application (Japanese Patent Application No. 2002-307300) filed on October 22, 2002, the entirety of which is incorporated by reference. It is used by.

Claims (12)

In a color liquid crystal display device comprising a light shutter using a liquid crystal, a color filter having at least three color elements of red, green, and blue corresponding to the light shutter, and a backlight for transmitting illumination, The wavelength of each of the visible light region 380~780㎚ 5㎚ to λ _n ㎚ and Spectral transmittance at wavelength λ _n nm by the green pixel of this color filter was T ^G (λ _n ) and relative emission intensity normalized to total emission intensity at wavelength λ _n nm from the backlight was defined as I (λ _n ). At this time, they satisfy the following conditions (1) to (3), (1) 500㎚ <The method according to any one of the wavelength of λ _n <530㎚ I (λ _n ) × T ^G (λ _n )> 0.01 (2) 610㎚ <a wavelength region of λ _n <650㎚ I (λ _n ) × T ^G (λ _n ) <0.0001 (3) 400㎚ <a wavelength region of λ _n <450㎚ I (λ _n ) × T ^G (λ _n ) <0.0001 Provided that I (λ _n ) is defined as Wherein S (λ) is the actual measured value of the light emission intensity at the wavelength λ from the backlight, and Δλ = 5 nm. The method of claim 1, The backlight has a phosphor layer or phosphor film, and the phosphor layer or the phosphor film contains a compound represented by the following general formula (4), M ^II _1-x Eu _x O.a (Mg _1-y Mn _y ) O.bAl ₂ O ₃ (4) Here, M ^II represents at least one atom selected from the group consisting of Ba, Sr and Ca, and a, b, x, y are real numbers that satisfy the following inequality, 0.8 ≤ a ≤ 1.2 4.5 ≤ b ≤ 5.5 0.05 ≤ x ≤ 0.3 0.02 ≤y ≤0.5 A color liquid crystal display device, characterized in that. The method of claim 1, The backlight has at least one emission peak in a wavelength region of 500 to 530 nm, Xy chromaticity diagram when the chromaticity points in the CIE XYZ colorimetric system of red, green, and blue pixels are (x _R , y _R ), (x _G , y _G ), (x _B , y _B ) The area of the triangle surrounded by these three points on the three points is defined by the National Television System Committee (NTSC) of the United States in three standard colors: red (0.67, 0.33), green (0.21, 0.71), and blue (0.14, 0.08). Color liquid crystal display device, characterized in that more than 80% of the area surrounded by. The method of claim 1, The green pixel is a photosensitive colored resin composition containing (a) a binder resin and / or (b) a monomer, (c) a photopolymerization clock, and (d) a colorant, and (d) a isoindolinone pigment as a colorant. The color liquid crystal display device formed with the photosensitive coloring resin composition characterized by the average transmittance of 500-530 nm when it apply | coats with a film thickness of 2.5 micrometers 20% or more and 80% or less. A photosensitive colored resin composition containing (a) a binder resin and / or (b) a monomer, (c) a photopolymerization clock, and (d) a colorant, wherein (d) an isoindolinone pigment is contained as the colorant, and the film thickness is 2.5. The average transmittance | permeability of 500-530 nm when apply | coating at micrometer is 20% or more and 80% or less, The photosensitive colored resin composition characterized by the above-mentioned. The color filter which formed the green pixel by the photosensitive coloring resin composition of Claim 5. A color liquid crystal display device comprising a light shutter using a liquid crystal, a color filter having at least three color elements of red, green, and blue corresponding to the light shutter, and a backlight for transmitting illumination, The spectral transmittance at wavelength λ _n nm by the red pixel of this color filter is T ^R (λ _n ), and the relative luminescence intensity normalized to the total emission intensity at wavelength λ _n nm from this backlight is I (λ _n ). When we did, These satisfy the conditions of the following (5) and (6), (5) at a wavelength of any one of 615 nm ≤ λ _n ≤ 700 nm I (λ _n ) × T ^R (λ _n ) ≥0.01 (6) at λ _n = 585 nm I (λ _n ) × T ^r (λ _n ) <0.007 However, I (λ _n ) is the same as the above-mentioned item 1, wherein the color liquid crystal display device. The method of claim 7, wherein A color liquid crystal display device, wherein T ^R (λ _n ) satisfies T ^R (λ _n ) / T ^R (585)> 8 at any wavelength of 615 nm ≤ λ _n ≤ 700 nm. The method of claim 7, wherein The backlight has a phosphor layer or a phosphor film, and the phosphor layer or the phosphor film includes YVO ₄ : Eu ³⁺ phosphor, Y (P, V) O ₄ : Eu ³⁺ phosphor, and 3.5MgO.0.5MgF _2. A color liquid crystal display device comprising one or two or more selected from the group consisting of GeO ₂ : Mn ⁴⁺ based phosphors. The method of claim 7, wherein And said backlight comprises an LED in its structure, said LED comprising a GaAsP-based LED. The method of claim 7, wherein And the backlight has at least one emission peak in a wavelength region of 615 to 700 nm. The method of claim 7, wherein A color liquid crystal display device according to claim 1, which is a color liquid crystal display device.